Nickel compounds
Compounds of nickel are chemical compounds containing the element nickel which is a member of the group 10 of the periodic table. Most compounds in the group have an oxidation state of +2. Nickel is classified as a transition metal with nickel(II) having much chemical behaviour in common with iron(II) and cobalt(II). Many salts of nickel(II) are isomorphous with salts of magnesium due to the ionic radii of the cations being almost the same. Nickel forms many coordination complexes. Nickel tetracarbonyl was the first pure metal carbonyl produced, and is unusual in its volatility. Metalloproteins containing nickel are found in biological systems.
Nickel forms simple binary compounds with non metals including halogens, chalcogenides, and pnictides. Nickel ions can act as a cation in salts with many acids, including common oxoacids Salts of the hexaaqua ion (Ni•6H2O2+) are especially well known. Many double salts containing nickel with another cation are known. There are organic acid salts. Nickel can be part of a negatively charged ion (anion) making what is called a nickellate. Numerous quaternary compounds (with four elements) of nickel have been studied for super conductivity properties, as nickel is adjacent to copper and iron in the periodic table can can form compounds with the same structure as the high-temperature superconductors that are known.
Colour
Most of the common salts of nickel are green due to the presence of hexaaquanickel(II) ion, Ni(H2O)2+.
Geometry
Nickel atoms can connect to surrounding atoms or ligands in a variety of ways. Six coordinated nickel is the most common and is octahedral, but this can be distorted if ligands are not equivalent. For four coordinate nickel arrangements can be square planar, or tetrahedral. Five coordinated nickel is rarer.
Magnetism
Some nickel compounds are ferromagnetic at sufficiently low temperatures. In order to show magnetic properties the nickel atoms have to be close enough together in the solid structure.
Binary compounds
A binary compound of nickel contains one other element. Substances that contain only nickel atoms are not actually compounds.
In a noble gas matrix, nickel can form dimers, a molecule with two nickel atoms: Ni2.[1] Ni2 has a bonding energy of 2.07±0.01 eV. For Ni2+ the bond energy is around 3.3 eV. Nickel dimers and other clusters can also be formed in a gas and plasma phase by shooting a powerful laser at a nickel rod in cold helium gas.[2]
oxides
Nickel oxides include Nickel(II) oxide and Nickel(III) oxide.
Hydroxides
Nickel hydroxides are used in nickel–cadmium and Nickel–metal hydride batteries. Nickel(II) hydroxide Ni(OH)2, the main hydroxide of nickel is coloured apple green. It is known as the mineral theophrastite. β-NiO(OH) is a black powder with nickel in the +3 oxidation state. It can be made by oxidising nickel nitrate in a cold alkaline solution with bromine. A mixed oxidation state hydroxide Ni3O2(OH)4 is made if oxidation happens in a hot alkaline solution. A Ni4+ hydroxide: nickel peroxide hydrate NiO2•H2O, can be made by oxidising with alkaline peroxide. It is black, and unstable and oxidises water.
Halides
Nickel(II) fluoride NiF2 is yellow, crystallising in the rutile structure and can form a trihydrate, NiF2·3H2O.[3] A tetrahydrate also exists.[4]
Nickel chloride NiCl2 is yellow, crystallising in the cadmium chloride structure. It can form a hexahydrate, NiCl2·6H2O, a tetrahydrate NiCl2·4H2O over 29 °C and a dihydrate, NiCl2·2H2O over 64 °C.[3]
nickel bromide NiBr2 is yellow, also crystallising in the cadmium chloride structure. It can form a hexahydrate, NiBr2·6H2O.[3] Crystallisation above 29° forms a trihydrate NiBr2·3H2O, and a dihydrate NiBr2·2H2O.[5] Enneahydrate, NiBr2·9H2O can crstallise from water below 2 °C.[3] Nickelous hexammine bromide Ni(NH3)6Br2is violet or blue. It is soluble in boiling aqueous ammonia, but is insoluble in cold.[3] Diammine, monoammine, and dihydrazine nickel bromides also exist.[3]
With four bromide atoms nickel(II) forms a series of salts called tetrabromonickelates.
Nickel iodide NiI2 is black, also crystallising in the cadmium chloride structure. It can form a green hexahydrate, NiI2·6H2O.[3] Nickel iodide has a brown diammine NiI2•2NH3 and a bluish-violet hexammine NiI2•6NH3.[3]
Nickel(III) fluoride NiF3
Nickel(IV) fluoride NiF4
Chalcogenides
By reacting nickel with chalcogens, nickel sulfide, nickel selenide, and nickel telluride are formed. There are numerous sulfides: Ni1.5S, Ni17S18, Ni3S2 (heazlewoodite), Ni3S4 (polydymite), Ni9S8 (godlevskite), NiS (millerite) and two other NiS forms, NiS2 (vaesite) in pyrite structure. Black nickel tetrasulfide NiS4 is formed from ammonium polysulfide and nickel in water solution. Mixed and double sulfides of nickel also exist. Nickel with selenium forms several compounds Ni1−xSe 0≤x≤0.15, Ni2Se3, NiSe2 also known as a mineral penroseite.
Nickel forms two different polonides by heating nickel and polonium together: NiPo and NiPo2.[6]
Pnictides
Non-stoichiometric compounds of nickel with phosphorus, arsenic and antimony exist, and some are found in nature. One interstitial nitride has formula Ni3N (hexagonal P6322, Z = 2, a = 4.6224 Å and c = 4.3059 Å).[7] In a solid nitrogen matrix, nickel atoms combine with nitrogen molecules to yield Ni(N2)4.[1]
Nickel phosphide Ni2P has density 7.33 and melts at 1100 °C.[4]
The mineral chloanthite has formula NiAs2, nickeline has formula NiAs and breithauptite has formula NiSb. NiAs melts at 967° and has density 7.77. NiSb melts at 1174°. It has the highest density of a nickel compound at 8.74 g/cm3.[4]
NiAsS gersdorffite, and NiSbS ullmannite, NiAsSe Jolliffeite are pnictide/chalcogenide compounds that occur as minerals.
Other
Nickel also forms carbides and borides. Nickel boride can take the forms Ni2B (a green/black solid), NiB, Ni3B, o-Ni4B3 and m-Ni4B3.[8] Nickel hydride NiH is only stable under high pressures of hydrogen.
Diatomic molecules
Hot nickel vapour reacting with other atoms in the gas phase can produce molecules consisting of two atoms. Nickel monofluoride can be observed by its emission spectrum in the gas phase.[9]
Nickel subchloride NiCl is formed in gaseous form when nickel chloride is vapourised, and is the most common in the gas phase above 1450 K. It is formed when nickel is exposed to hot, low pressure chlorine.[10]
Nickel monobromide, NiBr can exist in the gas phase when an electric discharge goes through NiBr2 gas.[9][11][12]
Nickelmonoiodide can exist in the gas phase.[9]
Formula | wt | distance | energy | refs |
---|---|---|---|---|
pm | kcal/mol | |||
NiH | ||||
NiF | ||||
NiCl | ||||
NiBr | ||||
NiI | ||||
Ni2 | 46 | [2] | ||
NiAu | 58 | [13] | ||
Alloys
Compounds of nickel with other metals can be called alloys. The substances with fixed composition include nickel aluminide (NiAl) melting at 1638° with hexagonal structure.[4] NiY, NiY3, Ni3Y, Ni4Y, NiGd3,[14]
BaNi2Ge2 changes structure from orthorhombic to tetragonal around 480 °C.[15] THis is a ternary intermetallic compound. Others include BaNiSn3 and the superconductors SrNi2Ge2, SrNi2P2, SrNi2As2, BaNi2P2, BaNi2As2.[15]
Simple salts
Oxo acid salts
Nickel(II) sulfate can crystallise with six water molecules yielding Retgersite or with seven making Morenosite which is isomorphic to Epsom salts. These contain the hexaquanickel(II) ion.[16] There is also an anhydrous form, a dihydrate and a tetrahydrate, the last two crystallised from sulfuric acid. The hexahydrate has two forms, a blue tetragonal form, and a green monoclinic form, with a transition temperature around 53 °C.[17] The heptahydrate crystallises from water below 31.5 above this blue hexhydrate forms, and above 53.3 the green form.[18] Heating nickel sulfate dehydrates it, and then 700° it loses sulfur trioxide, sulfur dioxide and oxygen.
Nickel sulfite can be formed by bubbling sulfur dioxide through nickel carbonate suspended in water. A solution is formed that slowly loses sulfur dioxide, and which crystallises nickel sulfite hexahydrate. Crystals are frequently in the shape of stars, caused by the two opposite triangular enantiomorphs growing base to base. nickel sulfite hexahydrate is highly piezoelectric. Optically it is uniaxial negative with refractive indexes ω=1.552 ε=1.509.[19] When heated it dehydrates and then ends up making nickel oxide and nickel sulfate.[20]
Nickel thiosulfate NiS2O3 has the same structure as the magnesium salt. It has alternating layers of octahedral shaped nickel2+ hexahydrate, and tetrahedral shaped S2O32− perpendicular to the β direction.[21] When heated to 90 °C it decomposes to form NiS. NiS2O3 can be made from BaS2O3 and NiSO4.[22] Nickel sulfamate can be used for nickel or mixed nickel-tungsten plating.[23] It can be formed by the action of sulfamic acid on nickel carbonate.[24]
Nickel selenite NiSeO3 has many different hydrates, anhydrous NiSeO3• 1⁄3H2O, NiSeO3•H2O, NiSeO3•2H2O (which is also a mineral called ahlfeldite), and NiSeO3•4H2O.[25]
Nickel nitrate commonly crystallises with six water molecules,[16] but can also be anhydrous, or with two, four or nine waters.[26] triphenylphosphine oxide nickel nitrate [(C6H6)3PO]2Ni(NO3)2 is non ionic, with nitrato as a ligand. It can be made from nickel perchlorate. It is yellow and melts at 266 °C.[27]
Nickel carbonate NiCO3•6H2O, hellyerite,[28] crystallising with six water molecules, precipitates when an alkali bicarbonate is added to a Ni aqueous solution.[16] Basic nickel carbonate, zaratite, with the formula Ni4CO3(OH)6(H2O)4, is produced when alkali carbonates are added to a nickel solution. Nickel phosphate, Ni3(PO4)2•7H2O is also insoluble.[16] A number of other phosphates have been made, including nanoporous substances resembling zeolites named with "Versailles Santa Barbara" or VSB. The nanoporous nickel phosphates can accommodate sufficiently small molecules and selectively catalyse reactions on them.[29] A nickel arsenate, Ni3(AsO4)2·8H2O occurs as the mineral annabergite.[30]
Nickel perchlorate, Ni(ClO4)2•6H2O,[16] nickel chlorate, Ni(ClO3)2•6H2O[31]nickel chromate (NiCrO4), nickel chromite (NiCr2O4), nickel(II) titanate, nickel bromate Ni(BrO3)2•6H2O[32] nickel iodate (Ni(IO3)2•4H2O), nickel stannate (NiSnO3•2H2O)[4] are some other oxy-salts.
The uranates include NiU2O6,[33] NiUO4 α and β forms (orthorhombic a=6.415 Å; b=6.435 Å; c=6.835 Å),[34] and NiU3O10.[34]
formula | name | mol | struct | cell Å | ° | V | Z | density | colour | refs | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|
wt | a | b | c | β | Å3 | g/cm3 | ||||||
NiSO3•6H2O | nickel sulfite hexahydrate | hexagonal | 8.794 | 9.002 | 603 | 2.04 | emerald green | [19][35] | ||||
NiSO3•3H2O | nickel sulfite trihydrate | light green | [36] | |||||||||
NiSO3•3N2H4•H2O | nickel sulfite trihydrazine hydrate | rose | [20] | |||||||||
NiSO3•2N2H4•H2O | nickel sulfite dihydrazine hydrate | blue | [20] | |||||||||
NiS2O3.6H2O | Nickel thiosulfate hexahydrate | 463.03 | orthorhombic | 9.282 | 14.44 | 6.803 | 912.1 | 4 | 2.03 | green | [21] | |
diaqua (4,4´-dimethylbipyridine- N,N´)(methanol) thiosulfato(S) nickel(II) | triclinic | 8.157 | 9.685 | 11.714 | α=76.73 β=73.56 γ=78.23 | 854.2 | 2 | [37] | ||||
aqua terpyridine(N,N´,N´´) thiosulfato(S,O) nickel(II) hemihydrate | monoclinic,C2/c | 27.866 | 9.274 | 14.216 | 114.24˚ | 3350. | 8 | [37] | ||||
bis(dipyridylamine) thiosulfato(S,O) nickel(II) hemihydrate | orthorhombic, Iba2 | 12.986 | 16.821 | 19.479 | 4254.9 | 8 | [37] | |||||
NiS2O3(2,9-dimethyl-1,10-phenanthroline)(H2O)·H2O·CH3OH | monoclinic, C2/c | 26.269 | 7.641 | 18.381 | 97.00 | 3662 | 8 | [38] | ||||
NiS2O3(2,9-dimethyl-1,10-phenanthroline) | monoclinic, P21/n | 11.108 | 10.955 | 11.666 | 103.32˚ | 1381.4 | 4 | [38] | ||||
Ni(NH2SO3)2•4H2O | Nickel sulfamate tetrahydrate | 322.95 | triclinic P1 | 6.33 | 6.73 | 6.78 | α= 88.9 β=67.87 γ=67.76 | 245.27 | 1 | 2.19 | green | [24] |
Ni(SO3F)2 | nickel fluorosulfate | yellow | [39] | |||||||||
NiSeO3 | anhydrous nickel selenite | 742.68 | C2/c | 15.4915 | 9.9355 | 14.8416 | 111.173 | 2130.15 | 32 | 4.630 | yellow brown | [25] |
NiSeO3 | anhydrous nickel selenite | 742.68 | Orthorhombic | 5.8803 | 7.5235 | 4.9394 | 218.52 | yellow green high pressure | [40] | |||
NiSeO3•1/3H2O | alpha nickel selenite one third hydrate | triclinic P1 | 8.1383 | 8.4034 | 8.5724 | α=123.713 β=90.174 γ=111.823 | 435.83 | 2 | 1.429 | citron yellow | [25] | |
NiSeO3•1/3H2O | beta nickel selenite one third hydrate | triclinic P1 | 8.0222 | 8.2133 | 8.4364 | α=68.654 β=61.782 γ=66.363 | 438.11 | 2 | 1.422 | citron yellow | [25] | |
NiSeO3•2H2O | nickel selenite dihydrate | monoclinic | 6.3782 | 8.7734 | 7.5467 | 81.451 | 417.61 | 4 | 3.524 | yellow brown | [25] | |
NiSeO3•4H2O | nickel selenite tetrahydrate | light green | [25] | |||||||||
NiSe2O5 | anhydrous nickel pyroselenite | Pnab Orthorhombic | 60754 | 10.3662 | 6.7913 | 427.71 | 4 | 4.605 | light yellow | [25] | ||
Ni12F2(SeO3)8(OH)6 | nickel hydroxo fluoro selenite Dumortierite structure | hexagonal P63mc | 12.702 | 4.922 | 1 | [41] | ||||||
Ni12(SeO3)8(OH)8 | nickel hydroxy selenite Dumortierite structure | hexagonal P63mc | 12.7004 | 4.9201 | 687.28 | 1 | pale green | [41] | ||||
NiTeO3 | anhydrous nickel tellurite | Orthorhombic | 5.9564 | 7.4986 | 5.2128 | 232.83 | yellow green high pressure | [40] | ||||
Ni3TeO6 | trinickel tellurate | Hexagonal | 5.103 | 5.103 | 13.781 | 4.272 | [42] | |||||
NiTe2O5 | nickel pyrotellurite | Orthorhombic | 8.869 | 8.441 | 12.126 | 5.042 | [42] | |||||
Ni2Te3O8 | Monoclinic | 12.392 | 5.207 | 11.496 | 98.6 | 5.702 | [42] | |||||
Ni6(TeO3)4(OH)4 | nickel hydroxy tellurite | hexagonal | 12.993 | 4.958 | 2 | light green | [43] | |||||
Ni5Te4O12Cl2 | nickel tellurium oxychloride | 1066.585 | Monoclinic | 19.5674 | 5.2457 | 16.3084 | 125.289 | 1366.38 | 4 | 5.186 | orange | [44] |
Ni5Te4O12Br2 | nickel tellurium oxybromide | 1155.77 | Monoclinic | 20.255 | 5.2498 | 16.3005 | 124.937 | 1421.0 | 4 | 5.403 | orange | [44] |
Ni5Te4O12I2 | nickel tellurium oxyiodide | Monoclinic | 20.766 | 5.230 | 16.464 | 125.79 | 1451.1 | 4 | brown | [44] | ||
Ni11(HPO3)8(OH)6 | nickel hydroxyphosphite | hexagonal | 12.6329 | 4.9040 | 677.77 | 1 | light green | [45] | ||||
NiMoO4.xH2O | nickel molybdate | monoclinic | 11.923 | 8.220 | 14.007 | 113.01 | 1264 | [46] | ||||
Ni(NO3)2•2H2O | nickel nitrate dihydrate | triclinic | 5.09465 | 7.10410 | 8.42881 | γ=78.698 β=102.7640 α=83.1985 | 287.5 | [46] | ||||
Ni(NO3)2•4H2O | nickel nitrate tetrahydrate | triclinic | 7.5710 | 6.623 | 16.26 | γ=97.26 β= 90.015 α=82.57 | 802.3 | [46] | ||||
NiN2O2 | nickel hyponitrite | light green | [47] | |||||||||
NiP2O6•12H2O | nickel hypodiphosphate | orthorhombic Pnmm | 11.2418 | 18.5245 | 7.3188 | 1523.1 | 4 | 2.142 | [48] | |||
Ni3(PO4)2 | nickel phosphate | monoclinic | 10.1059 | 4.6964 | 5.8273 | 91.138 | 276.52 | 2 | 4.396 | greenish yellow | [49] | |
α-Ni2P2O7 | nickel pyrophosphate | monoclinic | 6.9177 | 8.275 | 8.974 | 113.879 | 469.7 | 4 | 4.12 | ∃ α',β and δ forms | [50] | |
NiHPO4 | nickel hydrogen orthophosphate | beige yellow | [51] | |||||||||
[Ni(PO3)2]3•hydrate | nickel trimetaphosphate | [51] | ||||||||||
[Ni(PO3)2]4•hydrate | nickel tetrametaphosphate | [51] | ||||||||||
Ni2P4O12 | nickel cyclotetraphosphate | monoclinic C12/c1 | 11.611 | 8.218 | 9.826 | 118.41 | 824.7 | 4 | green | [52] | ||
Ni12H6(PO4)8(OH)6 | nickel hydroxy phosphate | hexagonal | 12.4697 | 4.9531 | 1 | light green | [43] | |||||
(H3O+/NH4+)4[Ni18(HPO4)14(OH)3F9]·12H2O | Nanoporous nickel phosphate VSB-1 | hexagonal | 19.834 | 5.0379 | 1710 | [29] | ||||||
Ni20[(OH)12(H2O)6][(HPO4)8(PO4)4]•12H2O | Nanoporous nickel phosphate VSB-5 | hexagonal | 18.153 | 6.387 | 1827 | [29] | ||||||
Ni3P6O18•17H2O | nickel hexametaphosphate | triclinic | 9.109 | 9.267 | 10.75113 | α=84.885 β=102.44 γ=101.64 | 867.4 | pale green | [53] | |||
Ni3(AsO4)2·8H2O | annabergite | Monoclinic | 10.179 | 13.309 | 4.725 | 105 | 2 | light green | [54] | |||
Ni12H6(AsO4)8(OH)6 | nickel hydroxy arsenate | hexagonal | 12.678 | 5.0259 | 1 | light green | [43] | |||||
NiAs2O4 | Nickel arsenite | [55] | ||||||||||
Ni3(AsO4)3 | o-nickel orthoarsenate | 454.01 | orthorhombic | 5.943 | 11.263 | 8.164 | 546.5 | 4 | 5.517 | [56] | ||
Ni3(AsO4)3 | m-nickel orthoarsenate xanthiosite | 453.91 | monoclinic | 5.764 | 9.559 | 10.194 | 92.95 | 560.9 | 4 | 5.394 | golden yellow | [56] |
Ni8.5As3O16 | Aerugite | 979.8 | trigonal | 5.9511 | 27.567 | 281.9 | 1 | 5.772 | dark green | [57] | ||
NiSb2O4 | Nickel antimonite | tetragonal | 8.6388 | 5.9052 | 413.58 | (at 240K) | [58] | |||||
NiSb2O6 | Nickel metaantimonate nickel antimony oxide |
P42/mnm | 4.62957 | 9.1981 | 2 | [59] | ||||||
Ni(H2O)6[Sb(OH)6]2 | bottinoite Nickel hydroxy antimonate | P3 | 16.060 | 9.792 | 2187.2 | 6 | pale blue | [60] | ||||
NiTa2O6 | Nickel metatantalate | P42/mnm | 4.71581 | 9.1163 | 2 | [59] | ||||||
NiSn(SO3F)6 | nickel tin fluorosulfate | light yellow | [39] | |||||||||
Ni(SO3CF3)2 | nickel trifluoromethanesulfonate | [61] | ||||||||||
NiSn(SO3CF3)6 | nickel tin triflate | light yellow | [39] | |||||||||
(Ni,Mg)10Ge3O16 | 871.7 | trigonal R3 | 5.8850 | 28.6135 | 286.1 | 1 | 5.060 | [62] | ||||
NiCO3 | anhydrous nickel carbonate | 118.72 | rhombohedral | 4.6117 | 14.735 | 271.39 | 6 | 4.358 | [63] | |||
Ni2SiO4 | nickel orthosilicate liebenbergite nickel silicate olvine |
orthorhombic Pbnm | 4.727 | 10.120 | 5.911 | 285.0 | 4 | [64] | ||||
Ni2GeO4 | nickel orthogermanate | cubic Fd3m | 8.221 | 8 | [65] | |||||||
Ni(CN)2 | anhydrous nickel cyanide | tetragonal quad layer | 4.8570 | 12.801 | 4 | [66] | ||||||
NiB4O7 | γ-nickelborateγ | P6522 | 4.256 | 34.905 | 547.5 | 6 | [67] |
Fluoro acid salts
Nickel tetrafluoroborate, Ni(BF4)2•6H2O is very soluble in water, alcohol and acetonitrile. It is prepared by dissolving nickel carbonate in tetrafluoroboric acid.[68][69] Nickel tetrafluoroberyllate NiBeF4•xH2O, can be hydrated with six or seven water molecules.[70] Both nickel hexafluorostannate NiSnF6.6H2O and nickel fluorosilicate NiSiF6.6H2O crystallise in the trigonal system.[71] Nickel hexafluorogermanate NiGeF6 has a rosy-tan colour and a hexagonal crystal with a=5.241 Å unit cell volume is 92.9 Å3. It is formed in the reaction with GeF4 and K2NiF6.[72] Nickel fuorotitanate NiTiF6.6H2O crystallises in hexagonal green crystals. It can be made by dissolving nickel carbonate, and titanium dioxide in hydrofluoric acid. The crystal dimensions are a=9.54, c=9.91 density=2.09 (measure 2.03).[73]
Ni(AsF6)2, Ni(SbF6)2, Ni(BiF6)2 are made by reacting the hexafluoro acid with NiF2 in hydrofluoric acid.[72] They all have hexagonal crystal structure, resembling the similar salts of the other first row transition metals.[72] For Ni(AsF6)2 a=4.98, c=26.59, and V=571, formula weight= Z=3.[72] Ni(SbF6)2 is yellow with a=5.16Å, c = 27.90Å Z=3. The structure resembles LiSbF6, but with every second metal along the c axis missing.[74]
Others include the green fluorohafnate NiHfF6•6H2O, and Ni2HfF8•12H2O,[75] NiZrF6•6H2O [76]
Chloroacid salts
Nickel tetrachloroiodate Ni(ICl4)2 can be made by reacting iodine with nickel chloride. It consists of green needles.[77]
Nitrogen anion salts
Nickel cyanide tetrahydrate Ni(CN)2•4H2O is insoluble in water, but dissolves in aqueous ammonia.[4] It forms double salts with interesting structures.[66]
Nickel azide Ni(N3)2 is a sensitive explosive. It can be made by treating nickel carbonate with hydrazoic acid. Acetone causes the precipitation of the hydrous solid salt, which is green. At 490K it slowly decomposes to nitrogen and nickel metal powder, losing a half of the nitrogen in four hours.[78] Nickel azide is complexed by one azo group when dissolved in water, but in other solvents, the nickel atom can have up to four azo groups attached.[79] Nickel azide forms a dihydrate: Ni(N3)2•2H2O and a basic salt called nickel hydroxy azide Ni(OH)N3.[80]
Nickel amide, Ni(NH2)2 is a deep red compound that contains Ni6 clusters surrounded by 12 NH2 groups.[81] Nickel amide also forms a series of double salts. Other homoleptic nickel amides derived by substituting the hydrogen atoms are Ni[N(C6H5)2]2 (diphenyl) and boryl amides Ni[NBMes2Mes]2 and Ni[NBMes2C6H5]2.[82]
Organic acid salts
Nickel acetate has the formula (CH3COO)2Ni·4H2O. It has monodentate acetate and hydrogen bonding. A dihdrate also exists. Nickel acetate is used to seal anodised aluminium.[83]
Nickel formate Ni(HCOO)2.2H2O decomposes when heated to yield carbon dioxide, carbon monoxide, hydrogen, water and finely divided porous nickel.[84] All the nickel atoms are six coordinated, but half have four water molecules and two formate oxygens close to the atom, and the other half are coordinated by six oxygens of formate groups.[85]
Aspergillus niger is able to dispose of otherwise toxic levels of nickel in its environment by forming nickel oxalate dihydrate crystals.[86] nickel oxalate can also be formed in to various namorods and nanofibres by use of surfacants.[87] When heated nickel oxalate dihydrate dehydrates at 258° and decomposes to NiO over 316 °C.[88] Double oxalate salts where oxalate is a ligand on the nickel atom may be called oxalatonickelates.
Other organic acid salts of nickel include nickel oleate, nickel propionate, nickel butyrate, nickel caprylate, nickel lactate, nickel benzoate, nickel bis(acetyl acetonate), nickel salicylate, nickel alkyl phenyl salicylate. Nickel stearate forms a green solution, however when precipitated with alcohol a gel is produced, that also contains a mixture of basic salts, and free stearic acid.[89]
Nickel malonate, and nickel hydrogen malonate both crystallise with two molecules of water. They decomposes when heated to yield gaseous water, carbon dioxide, carbon monoxide, ethanol, acetic acid, methyl formate and ethyl formate. Nickel acetate exists as an intermediate and the final result is that solid nickel, nickel oxide, Ni3C and carbon remain.[90] With malonate nickel can form a bis-malonato-nickelate anion, which can form double salts.[91] Nickel maleate can be made from maleic acid and nickel carbonate in boiling water. A dihydrate crystallises from the water solution.[92] Nickel fumarate prepared from fumaric acid and nickel carbonate is pale green as a tetrahydrate, and mustard coloured as an anhydride. It decomposes when heated to 300° to 340° in vacuum. Decompostion mostly produces nickel carbide, carbon dioxide, carbon monoxide and methane. But also produced were butanes, benzene, toluene, and organic acid.[93]
Nickel succinate can form metal organic framework compounds.[94]
Nickel citrate complexes are found in leaves of some nickel accumulating plant species in New Caledonia such as Pycnandra acuminata.[95] Citrate complexes include NiHcit, NiHcit23−, Nicit−, Nicit24−, and Ni2H2cit24−. (ordered from low to high pH). Also there is Ni4H4cit35−. Nickel citrate is important in nickel plating.[96] When predipitation of nickel citrate is attempted a gel forms. This apparently consists of tangled fibres of [(C6H6O7)Ni]n, which can be reduced to nickel metal fibres less than a micron thick, and meters long.[97] Double nickel citrates exist, including tetraanion citrate when pH is over 9.5.[98] An amorphous nickel iron citrate Ni3Fe6O4(C6H6O7)8·6H2O produces carbon monoxide, carbon dioxide and acetone when heated over 200 °C leaving Trevorite, NiFe2O4 a nickel ferrite.[99] A green crystalline nickel citrate with formula Ni3(C6H5O7)2•10H2O melts at 529K and decomposition starts at 333K.[100]
Nickel glutarate in the form called Mil-77, [Ni20{(C5H6O4)20(H2O)8}]⋅40H2O is pale green. It crystallises in a porous structure containing twenty member rings. The 40 water molecules "occluded" in the porous channels come out when it is heated to 150 °C retaining the crystal framework. At 240 °C the crystal form changes and over 255° the remaining water is lost. Between 330° and 360° the organic components burn and it is destroyed.[101]
Cyclopropane carboxylic acid forms two basic salts with nickel, a hydrate Ni9(OH)2(H2O)6(C4H5O2)8·2H2O with density 1.554 Mg/m3 and an anhydrous form Ni5(OH)2(C4H5O2)8 with density 2.172 mg/m3.[102]
Nickel trifluoroacetate tetrahydrate exists, as well as two emerald green acid trifluoroacetates, a bridged trinuclear form [Ni3(CF3COO)6(CF3COOH)6](CF3COOH) and a hydrated acid form [Ni3(CF3COO)6(CF3COOH)2(H2O)4](CF3COOH)2 both with triclinic crystal form. The first has density 2.205 and the second 2.124. They are made by dissolving the nickel trifluoroacetate tetrahydrate in trifluoroacetic acid either anhydrous or 1% hydrated.[103]
Nickel naphthenate is used as a fuel additive to suppress smoke,[104] as a rubber catalyst and as an oil additive.
When Nickel benzoate is heated in a vacuum, carbon dioxide, carbon monoxide, benzene, benzoic acid, phenol, biphenyl, nickel, nickel oxide, and nickel carbide are formed.[105] It can crystallise as anhydrous, a trihydrate or a tetrahydrate.[106]
Nickel terephthalate can be made by a double decomposition of sodium terephtalate and nickel nitrate. Nickel terephthalate precipitates. Its solubility is 0.38 g/100g water at 25 °C. In ammonium hydroxide a violet solution forms. Boiling acetic acid converts the nickel to nickel acetate. The terephtalate converts to a basic salt when boiled in water. Understating this compound is important when reducing coloured contaminants in polymers made from terephthalate.[107]
formula | name | mol | struct | cell Å | ° | V | Z | density | colour | refs | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|
wt | a | b | c | β | Å3 | g/cm3 | ||||||
Ni(HCOO)2.2H2O | Nickel formate hydrate | monoclinic | 8.60 | 7.06 | 9.21 | 96°50′ | 4 | [85] | ||||
[Ni20{(C5H6O4)20(H2O)8}]⋅40 H2O | Nickel glutarate | cubic | 16.581 | 4559 | pale green | [101] | ||||||
Ni9(OH)2(H2O)6(C4H5O2)8·2H2O | nickel cyclopropane carboxylate hydrate | orthorhombic | 14.810 | 24.246 | 24.607 | 8836 | 4 | 1.554 | bright green | [102] | ||
Ni5(OH)2(C4H5O2)8 | nickel cyclopropane carboxylate | orthorhombic | 19.406 | 18.466 | 21.579 | 90 | 7733 | 8 | 2.172 | pale green | [102] | |
[Ni3(CF3COO)6(CF3COOH)6](CF3COOH) | Nickel acid trifluoroacetate | trigonal | 13.307 | 53.13 | 8148 | 6 | 2.205 | emerald green | [103] | |||
[Ni3(CF3COO)6(CF3COOH)2(H2O)4](CF3COOH)2 | Nickel acid trifluoroacetate hydrate | triclinic | 9.12 | 10.379 | 12.109 | α=84.59° β=72.20° γ=82.80° | 1080.9 | 1 | 2.124 | emerald green | [103] | |
K2[Ni(C6H5O7)(H2O)2]2·4H2O | potassium nickel citrate | triclinic | 6.729 | 9.100 | 10.594 | α=94.86 β=100.76 γ=103.70 | 613.5 | 1 | 1.942 | green | [108] | |
K2[Ni2(C6H5O7)2(H2O)4]·4H2O | Dipotassium tetraaquabis(μ-citrato-k4O:O',O'',O''')nickelate(II) tetrahydrate | 717.94 | monoclinic | 10.616 | 13.006 | 9.0513 | 93.09 | 1247.8 | 2 | 1.911 | green | [109] |
N(CH3)4[Ni4(C6H4O7)3(OH)(H2O)]·18H2O | tetramethyl ammonium nickel basic citrate | triclinic | 11.84 | 14.29 | 20.93 | 96.16 β=106.36 γ=94.89 | 3352 | 1 | bright green extremely weak | [108][110] | ||
Na2[Ni(C6H4O7)]•2H2O | disodium nickel citrate | green dec 371 | [98] | |||||||||
(NH4)2[Ni(HCit)•2H2O]2•2H2O | Dimeric ammonium diaquocitratonickelate (II) dihydrate | 639.79 | triclinic | 6.407 | 9.471 | 9.6904 | α=105.064 β=91.99 γ=89.33 | 567.5 | 1 | 1.872 | green | [111] |
(NH4)4[Ni(HCit)2]•2H2O | tetrammonium dicitratonickelate (11) dihydrate | 545.10 | monoclinic | 9.361 | 13.496 | 9.424 | 115.476 | 1074.9 | 2 | 1.684 | [111] | |
Na2[Ni(HCit)•2H2O]2•2H2O | Dimeric sodium diaquocitratonickelate (II) dihydrate | [111] | ||||||||||
K2[Ni(HCit)•2H2O]2•2H2O | Dimeric potassium diaquocitratonickelate (II) dihydrate | [111] | ||||||||||
(NH4)2[Ni(H2O)6][Ti(H2cit)3]2·6H2O | 1547.43 | hexagonal | 15.562 | 7.690 | 1605.5 | 1 | 1.600 | light green | [112] | |||
[Ni(C5H7O2)2]3 | Nickel(II) acetylacetonate | 256.91 | orthorhombic | 23.23 | 9.64 | 15.65 | 3505 | 4 | 1.46 | dark green | [113] | |
Ni[C4O4]•2H2O | nickel squarate | ?cubic | 8.068 | 8.068 | 8.068 | 90° | 525 | 1.93 | green | [114] | ||
Ni[C4O4]•8H2O | nickel squarate octahydrate | 428.93 | monoclinic | 10.288 | 6.372 | 12.852 | 106.98 | 805.8 | 2 | 1.768 | green | [115] |
Ni[C5O5]•3H2O | Nickel croconate trihydrate | orthorhombic | green | [116] | ||||||||
K2[Ni(C5O5)2(H2O)2]•4H2O | Poly[[di-μ2-aqua-di-μ5-croconato(2-)-nickel(II)dipotassium(I)] tetrahydrate] | 525.11 | monoclinic | 8.015 | 6.660 | 16.489 | 90.20 | 880.1 | 2 | 1.982 | green | [117] |
Ni(C5H5COO)2•2H2O | nickel dibenzoate tetrahydrate | 354.98 | monoclinic | 6.1341 | 34.180 | 6.9793 | 95.331 | 1457.0 | 4 | 1.618 | light green | [106] |
Ni(C5H5COOCOOH)2•6H2O | nickel dihydrogen diphthalate hexahydrate | monoclinic | 16.024 | 5.574 | 12.500 | 113.42 | 2 | 1.611 | [118] | |||
Ni[C6H4(COO)2]•4H2O | Nickel terephthalate | green | [107] | |||||||||
Ni(OH)[C6H4(COO)(COOH)]•H2O | basic nickel terephthalate | green | [107] |
Double salts
Nickel is one of the metals that can form Tutton's salts. The singly charged ion can be any of the full range of potassium, rubidium, cesium, ammonium (NH4), or thallium.[119] As a mineral the ammonium nickel salt, (NH4)2Ni(SO4)2·6 H2O, can be called nickelboussingaultite.[120] With sodium, the double sulfate is nickelblödite Na2Ni(SO4)2·4 H2O from the blödite family. Nickel can be substituted by other divalent metals of similar sized to make mixtures that crystallise in the same form.[121]
Nickel forms double salts with Tutton's salt structure with tetrafluoroberyllate with the range of cations of ammonia,[122] potassium, rubidium, cesium,[123] and thallium.[124]
Anhydrous salts of the formula M2Ni2(SO4)3, which can be termed metal nickel triusulfates, belong to the family of langbeinites. The known salts include (NH4)2Ni2(SO4)3, K2Ni2(SO4)3 and Rb2Ni2(SO4)3, and those of Tl and Cs are predicted to exist.
Some minerals are double salts, for example Nickelzippeite Ni2(UO2)6(SO4)3(OH)10 · 16H2O which is isomorphic to cobaltzippeite, magnesiozippeite and zinczippeite, part of the zippeite group.[125]
Double hydrides of nickel exist, such as Mg2NiH4.[126]
formula | name | mol | struct | cell Å | ° | V | Z | density | colour | refs | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|
wt | a | b | c | β | Å3 | g/cm3 | ||||||
Li2[NiF(PO4)] | Lithium nickel fluorophosphate | 186.56 | orthorhombic | 10.473 | 6.289 | 10.846 | 714.3 | 8 | 3.469 | [127] | ||
Na2[NiF(PO4)] | sodium nickel fluorophosphate | Pbcn | 90 | 823.4 | [128] | |||||||
Na2Ni(SO4)2•4H2O | nickelblödite | monoclinic | 11.045 | 8.193 | 5.535 | 100.50 | 2.487 | green | [129] | |||
K2Ni2(SO4)3 | potassium nickel trisulfate | 483.77 | orthorhombic | 9.8436 | 9.8436 | 9.8436 | 90 | 3.369 | [130] | |||
Rb2Ni2(SO4)3 | rubidium nickel trisulfate | 576.51 | 9.9217 | 9.9217 | 9.9217 | 90 | 3.921 | [131] | ||||
(NH4)2Ni2(SO4)3 | ammonium nickel trisulfate | 441.65 | orthorhombic | 9.904 | 9.904 | 9.904 | 90 | 3.02 | [132] | |||
(NH4)4Ni3(SO4)5 | ammonium nickel pentasulfate | yellow | [133] | |||||||||
NiLa(SeO3)2Cl | nickel lanthanum diselenite chloride | hexagonal | 8.666 | 18.662 | 1194.2 | 6 | (153K) | [134] | ||||
NiNd10(SeO3)12Cl8 | nickel Neodymium diselenite chloride | monoclinic | 15.8175 | 1578,68 | 19.276 | 114.202 | 7407 | 4 | (153K) | [135] | ||
Ni6Fe3+2(SO4)(OH)16•4(H2O) | honessite | 904.08 | trigonal | 3.083 | 26.71 | 219.86 | 0.25 | 1.71 | green | [136] | ||
NiTi(SO4)3 | nickel titanium sulfate | monoclinic | 8.254 | 8.54 | 14.1444 | 124.967 | 817 | 4 | 3.21 | [137] | ||
Na2Ni(SeO4)2•2H2O | sodium nickel selenate dihydrate | triclinic | 5.507 | 5.905 | 7.172 | α = 108.56 °, β = 99.07 °, γ = 106.35 ° | 204.2 | 1 | [138] | |||
K2Ni(SeO4)2•2H2O | potassium nickel selenate dihydrate | [139] | ||||||||||
K2Ni(SeO4)2•6H2O | potassium nickel selenate Tuttons salt | 527.52 | monoclinic | a | b | c | 104.45 | 4 | 2.559 | bright green | [140] | |
Rb2Ni(SeO4)2•6H2O | rubidium nickel selenate Tuttons salt | 619.62 | monoclinic | a | b | c | 105.20 | 4 | 2.856 | bright green | [140] | |
Cs2Ni(SeO4)2•6H2O | caesium nickel selenate Tuttons salt | 713.62 | monoclinic | 9.426 | 12.961 | 6.473 | 106.17 | 759.5 | 2 | 3.114 | bright emerald green | [140][141] |
(NH4)2Ni(SeO4)2•6H2O | ammonium nickel selenate Tuttons salt | 485.68 | monoclinic | a | b | c | 106.29 | 4 | 2.243 | bright green | [140] | |
Tl2Ni(SeO4)2•6H2O | thallium nickel selenate Tuttons salt | monoclinic | a | b | c | 105.60 | 4 | 3.993 | bright green | [142] | ||
K2NiP2O7 | 310.85 | monoclinic P21 | 9.230 | 17.540 | 8.32 | 91.44 | 1346.3 | 8 | 3.067 | [143] | ||
K6Sr2Ni5(P2O7)5 | 786.55 | monoclinic P21/c | 11.038 | 9.53 | 7.438 | 100.13 | 1578 | 2 | 3.309 | yellow | [143] | |
NaNi2(SO4)2[(H2O)(OH)] | monoclinic C2/m Natrochalcite-type | 8.605 | 6.185 | 7.336 | 114.78 | 354.5 | 2 | [144] | ||||
BaNi2(PO4)2 | barium nickel phosphate | Trigonal R-3 | 4.8112 | 4.8112 | 23.302 | 467.1 | 3 | green | [145] | |||
BaNi2(AsO4)2 | barium nickel arsenate | Trigonal R-3 | 4.945 | 4.945 | 23.61 | 532.59 | 3 | 5.31 | [145] | |||
BaNi2(VO4)2 | barium nickel vanadate | Trigonal R-3 | 5.0375 | 5.0375 | 22.33 | 3 | [146] | |||||
Na4Ni7(AsO4)6 | tetrasodium heptanickel hexaarsenate | 1336.3 | monoclinic C2/m | 14.538 | 14.505 | 10.6120 | 118.299 | 1970.3 | 4 | brown | [147] | |
K2Ni(CO3)2•H2O | potassium nickel carbonate Potassium tetraaquadicarbonatonickelate |
monoclinic Baylissite-type | 6.755 | 6.156 | 12.2406 | 113.265 | 467.6 | 2 | 2.34 | [148] | ||
Rb2Ni(CO3)2•H2O | Rubidium nickel carbonate | monoclinic Baylissite-type | 6.971 | 6.348 | 12.2807 | 114.289 | 495.34 | 2 | 2.83 | [149] | ||
NiTh(NO3)6•8H2O | nickel thorium nitrate | Monoclinic P21/c | 9.089 | 8.728 | 13.565 | 96.65 | 1068.8(2) | [150] | ||||
K[NiGa2(PO4)3(H2O)2] | Potassium nickel(II) gallium phosphate hydrate | 558.17 | Monoclinic C2/c | 13.209 | 10.173 | 8.813 | 107.68 | 1128.4 | Z = 4 | [151] | ||
KNi3(PO4)P2O7 | Potassium trinickel(II) orthophosphate diphosphate | 484.14 | Monoclinic | 9.8591 | 9.3953 | 9.9778 | 118.965 | 808.63 | 4 | [152] | ||
KNiPO4 | potassium nickel phosphate | [153] | ||||||||||
KNiPO4•6H2O | potassium nickel phosphate hexahydrate | monoclinic P21 | 6.8309 | 11.0610 | 6.1165 | 91.045 | 462.07 | 2 | [154] | |||
NiK4(P3O9)2•7H2O | nickel potassium tricyclophosphate hydrate | orthorhombic Fm2m | 23.03 | 11.882 | 8.732 | 4 | blue | [155] | ||||
NiK4(P3O9)2 | nickel potassium tricyclophosphate | triclinic P-1 | 6.143 | 6.80 | 12.80 | α=102.8 β=89.7 γ=66.03 | 473.56 | 1 | [155] | |||
NaK5Ni5(P2O7)4 | Sodium pentapotassium pentanickel tetra(diphosphate) | 1207.80 | triclinic | 7.188 | 9.282 | 10.026(5) | α=109.31 β=90.02 γ=104.07 | 610.0 | 1 | [156] | ||
NH4NiPO4.H2O | ammonium nickel phosphate hydrate | orthorhombic | 5.566 | 8.760 | 4.742 | 231.2 | [157] | |||||
NH4NiPO4.6H2O | ammonium nickel phosphate hydrate Ni-struvite |
Orthorhombic Pmn21 | 6.924 | 6.104 | 11.166 | 471.5 | 2 | [158][159][160] | ||||
LiNiPO4 | lithium nickel phosphate | orthorhombic | 10.032 | 5.855 | 4.681 | 274.9 | 4 | brown | [161] | |||
NaNiPO4 | sodium nickel phosphate | Pnma maricite structure | 8.7839 | 6.7426 | 5.0368 | 298.31 | 4 | yellow | [162] | |||
NaNiPO4 | sodium nickel phosphate | Pnma triphylite form | 4.98 | 6.13 | 9.98 | 304.23 | [163] | |||||
Na4Ni7(PO4)6 | Cm | 10.550 | 13.985 | 6.398 | 104.87 | 912.4 | 2 | 3.906 | [162][164] | |||
NaNiPO4•7H2O | sodium nickel phosphate heptahydrate | tetrahedral P42/mmc | 6.7390 | 10.9690 | 498.15 | 2 | [154] | |||||
Na3NiP3O10•12H20 | trisodium nickel triphosphate dodecahydrate | monoclinic (pseudoorthorhombic) | 15.0236 | 9.1972 | 14.6654. | 90.0492 | 2014.46 | 1.967 | light green | [165] | ||
Na2Ni3(OH)2(PO4)2 | sodium nickel hydroxide phosphate | monoclinic | 14.259 | 5.695 | 4.933 | 104.28 | 2 | 3.816 | [166] | |||
NiNa4(P3O9)2•6H2O | nickel tetrasodium cyclotriphosphate hexahydrate | triclinic | 6.157 | 6.820 | 10.918 | α=80.21 β=97.8 γ=119.5 | 409.8 | 1 | [167] | |||
NiRb4(P3O9)2 | nickel tetrarubidium cyclotriphosphate | P-31c | 7.288 | 7.288 | 20.343 | 2 | [168] | |||||
NiCs4(P3O9)2•6H2O | nickel tetracaesium cyclotriphosphate hydrate | orthorhombic | 19.992 | 6.500 | 18.445 | 4 | [155] | |||||
NiCs4(PO3)6 | nickel tetracaesium cyclotriphosphate | rhombohedral P-31c | 11.602 | 11.602 | 9.078 | 1058.24 | 2 | [155] | ||||
NiAg4(P3O9)2•6H2O | nickel tetrasilver cyclotriphosphate hexahydrate | triclinic | 9.209 | 8.053 | 6.841 | α=89.15 β=102.94 γ=97.24 | 1 | [169] | ||||
NiAg4(P3O9)2 | nickel tetrasilver cyclotriphosphate | triclinic | 6.100 | 6.783 | 10.764 | α = 78.66 β=96.85 γ=113.36 | 401 | 1 | [169] | |||
Ni(NH4)4(P3O9)2•4H2O | nickel tetraammonium cyclotriphosphate tetrahydrate | monoclinic | 2 | [170] | ||||||||
TlNi4(PO4)3 | Thallium nickel triphosphate | orthorhombic Cmc21 | 4 | pale yellow | [171] | |||||||
Tl4Ni6(PO4)6 | Thallium nickel hexaphosphate | monoclinic Cm | 4 | yellow brown | [171] | |||||||
Tl2Ni4P2O7(PO4)2 | monoclinic C2/c | 8 | brown | [171] | ||||||||
NiMnSb | Nickel manganese antimonide | cubic | 5.945 | 210.1 | 4 | 7.57 | [172] | |||||
NiMnSi | Nickel manganese silicide | Orthorhombic | 5.8967 | 3.6124 | 6.9162 | 147.32 | 4 | [173][174] | ||||
NiMnGe | orthorhombic Pnma | 6.053 | 3.769 | 7.090 | 161.75 | 2 | [175] | |||||
NiFeGe | hexagonal | [175] | ||||||||||
TiNiSi | orthorhombic | [175] | ||||||||||
NaNiIO6 | sodium nickel periodate | orthorhombic | 8.599 | 2.492 | 10.281 | 220.3 | [176] | |||||
KNiIO6 | potassium nickel periodate | orthorhombic | 12.09 | 3.683 | 6.062 | 269.9 | [176] | |||||
KNiIO6 | potassium nickel periodate | triclinic | 6.4203 | 5.075 | 4.223 | α= 65.07 β= 92.717 γ=109.95 | 116.51 | [176] |
Double fluorides include the above-mentioned fluoroanion salts, and those fluoronickelates such as NiF4 and NiF6. Other odd ones include an apple green coloured KNiF3·H2O and NaNiF3·H2O, aluminium nickel pentafluoride AlNiF5·7H2O, ceric nickelous decafluoride Ce2NiF10·7H2O, niobium nickel fluoride Ni3H4Nb2F20·19H2O, vanadium nickel pentafluoride VNiF5·7H2O, vanadyl nickel tetrafluoride VONiF4·7H2O, chromic nickelous pentafluoride CrNiF5·7H2O, molybdenum nickel dioxytetrafluoride NiMoO2F4·6H2O, tungsten nickel dioxytetrafluoride NiWO2F4·6H2O and NiWO2F4·10H2O, manganic nickel pentafluoride MnNiF4·7H2O, nickelous ferric fluoride FeNiF5·7H2O.[177]
Nickel trichloride double salts exist which are polymers. Nickel is in octahedral coordination, with double halogen bridges. Examples of this include RbNiCl3, pinkish tan coloured H2NN(CH3)3NiCl3.[178] Other double trichlorides include potassium nickel trichloride KNiCl3·5H2O,[179] yellow cesium nickel trichloride CsNiCl3,[179] lithium nickel trichloride LiNiCl3·3H2O,[179] hyrdrazinium nickel tetrachloride,[179] and nickel ammonium chloride hexahydrate NH4NiCl3·6H2O.[4]
The tetrachloronickelates contain a tetrahedral NiCl42− and are dark blue. Some salts of organic bases are ionic liquids at standard conditions.[180] tetramethylammonium nickel trichloride is pink and very insoluble.[181] Other tetrachlorides include rubidium nickel tetrachloride, lithium nickel tetrachloride Li2NiCl4·4H2O stable from 23 to 60°, stannous nickel tetrachloride SnCl2·NiCl2.6H2O, stannic nickel hexachloride SnCl4·NiCl2.6H2O is tetragonal.[182]
Lithium nickel hexachloride Li4NiCl6·10H2O is stable from 0 to 23°.
Copper nickel dioxychloride 2CuO·NiCl2·6H2O, and copper nickel trioxychloride 3CuO·NiCl2·4H2O.[179]
Cadmium dinickel hexachloride, CdCl2·2NiCl2.12H2O crystallises in hexagonal system, dicadmium dinickel hexachloride, 2CdCl2·NiCl2.12H2O has rhombic crystals, and is pleochroic varying from light to dark green.[182]
Thallic nickel octochloride 2TlCl3·NiCl2.8H2O is bright green.[182]
Double bromides include the tetrabromonickelates, and also caesium nickel tribromide, CsNiBr3 copper nickel trioxybromide, 3Cu0·NiBr2·4H20 mercuric nickel bromide, Hg2NiBr6, HgNiBr4. Aqueous nickel bromide reacting with mercuric oxide yields mercuric nickel oxybromide, 6NiO.NiBr2.HgBr2.20H2O didymium nickel bromide, 2(Pr,Nd)Br3.3NiBr2.18H2O is reddish brown (mixture of praseodymium and neodymium) Lanthanum nickel bromide, 2LaBr3.3NiBr2.18H2O nickel stannic bromide (or nickel bromostannate) NiSnBr6·8H2O is apple green.[183][184]
The tetraiodonickelates are blood red coloured salts of the NiI4 ion with large cations. Double iodides known include mercuric nickel hexaiodide 2HgI2•NiI2•6H2O, mercuric nickel tetraiodide HgI2•NiI2•6H2O, and lead nickel hexaiodide I2•2NiI2•3H2O.[3]
The diperiodatonickelates of nickel IV are strong oxidisers, and akali monoperiodatonickelates also are known.
Nonamolybdonickelate(IV), [NiMo9O32]6− can oxidise aromatic hydrocarbons to alcohols.[185]
Nickel forms double nitrates with the lighter rare earth elements. The solid crystals have the formula Ni3Me2(NO3)12.24H2O. The metals include La Ce Pr Nd Sm Gd and the non rare earth Bi. Nickel can also be replaced by similar divalent ions, Mg, Mn Co Zn. For the nickel salts melting temperatures range from 110.5° for La, 108.5° for Ce, 108° for Pr, 105.6° for Nd, 92.2° for Sm and down to 72.5° for Gd The Bi salt melting at 69°. Crystal structure is hexagonal with Z=3.[186] Ni3La2(NO3)12.24H2O becomes ferromagnetic below 0.393 K.[187] These double nickel nitrates have been used to separate the rare earth elements by fractional crystallization.[188]
Nickel thorium nitrate has formula NiTh(NO3)6•8H2O. Nickel atoms can be substituted by other ions with radius 0.69 to 0.83 Å. The nitrates are coordinated on the thorium atom and the water to the nickel. Enthalp of solution of the octahydrate is 7 kJ/mol. Enthalpy of formation is -4360 kJ/mol. At 109° the octahydrate becomes NiTh(NO3)6.6H2O, and at 190° NiTh(NO3)6.3H2O and anhydrous at 215°.[150] The hexahydrate has Pa3 cubic structure.[150]
Various double amides containing nickel clusters have been made using liquid ammonia as a solvent. Substances made include red Li3Ni4(NH2)11·NH3 (Pna21; Z = 4; a = 16.344(3) Å; b = 12.310(2) Å; c = 8.113(2) Å v=1631 D=1.942), and Cs2Ni(NH2)4•NH3 (P21/c; Z = 4; a =9.553(3) Å; b = 8.734(3) Å; c = 14.243(3) Å; β = 129.96(3)° V=910 D=2.960). These are called amidonickel compounds.[189] Yet others include Li4Ni4(NH2)12·NH3, Na2Ni(NH2)4,[190] orange red Na2Ni(NH2)4•2NH3,[191] Na2Ni(NH2)4•NH3, K2Ni(NH2)4•0.23KNH2, and Rb2Ni(NH2)4•0.23RbNH2.[189]
Nickel dihydrogen phosphide (Ni(PH2)2) can form orange, green or black double salts KNi(PH2)3) that crystallise from liquid ammonia. They are unstable above -78 °C, giving off ammonia, phosphine and hydrogen.[192]
Ternary chalcogenides
formula | name | colour | structure | production | references |
---|---|---|---|---|---|
NH4NiS5 | ammonium nickel sulphide | black | NH4 polysulfide+NiSO4 | [193][194] | |
K2Ni3S4 | potassium nickel tetrasulfide | bronze yellow | Fddd a=10.023 b=26.074 c=5.704 | NiSO4 K2CO3 S | [193][195][196] |
K2Ni11S10 | potassium nickel decasulfide | dark metallic green | NiO+KCNS | [193] J. Milbauer | |
Na2Ni3S4 | sodium nickel tetrasulfide | dark yellow | NiSO4 Na2CO3 S | [193] R. Schneider | |
KNi2S2 | potassium dinickel disulfide | orange yellow | Ni foil, S, K at 723K | [15][197] | |
K2Ni3Se4 | potassium nickel tetraselenide | gold | Fddd a=10.468 b=26.496 c=5.995 | [198][199] | |
KNi2Se2 | potassium dinickel diselenide | purple-red | I4/mmmtetragonal a=3.909, c=13.4142 | Ni foil, Se shot, K at 723K | [15][200] |
CsNi2Se2 | caesium dinickel diselenide | tetragonal a=3.988, c=14.419 | heat elements | [201] | |
TlNi2Se2 | Thallium dinickel diselenide | gold metallic | tetragonal | heat elements together in closed quartz tube | [202] |
Rb2Ni3S4 | rubidium nickel tetrasulphide | metallic greenish gold | Fmmm orthorhombic a=9.901 Å, b=13.606 Å and c=5.861 Z=4 layered; ferromagnetic only after water immersion | [198][203] | |
Rb2Ni3Se4 | rubidium nickel tetraselenide | golden metallic | Fddd orthorhombic a = 10.555 Å, b = 27.588 Å, c = 6.031 Å, Z = 8 layered; ferromagnetic only after water immersion | Rb2CO3 S Ni | [204] |
Cs2Ni3S4 | cesium nickel tetrasulphide | greenish gold | Fmmm a=10.038 b=14.552 c=5.934 | [199][204] | |
Cs2Ni3S4 | cesium nickel tetrasulphide | gold | Fmmm a=10.540 b=14.624 c=6.194 | [199] | |
BaNi4S5 | Barium nickel pentasulfide | bronze yellow | NiSO4 K2CO3 S | [193] R. Schneider; I. and L. Bellucci | |
Pb2Ni3S2 | lead nickel disulfide | melt 790° | PbS Ni | [205] W Guertler; W Guertler H Schack | |
(Ni,Fe)9S8 | Pentlandite | bronze yellow melt 870 | [205] T. Scheerer | ||
Fe2Ni2S4 | ferrous nickel tetrasulfide | melt 840 | [206] K Bornemann | ||
Fe2Ni2S3 | ferrous nickel trisulfide | stable over 575°, melt 886, | [207] K Bornemann | ||
Fe3Ni4S5 | ferrous nickel pentasulfide | below 575 | [207] K Bornemann | ||
Fe4Ni2S5 | [207] K Bornemann | ||||
Fe2Ni3S4 | [207] K Bornemann | ||||
Fe3Ni4S5 | [207] K Bornemann | ||||
Fe2Ni2S3 | [207] K Bornemann | ||||
FeNi2S4 | Violarite | dark violet grey | mineral oxidate | ||
Ni3Sn2S2 | [208] | ||||
Ni3Bi2S2 | superconducting | [208] | |||
Ni3Bi2Se2 | superconducting | [208] | |||
NiSnS3 | nickel thiostannate | greenish black | orthorhombic a=6.88 b=7.89 c=11.95 Z=8 V=644 | NiCl2 + SnS2 | [209] |
NiGeS33 | nickelselenogermanate | [210] | |||
Ta2NiS5 | Orthorhombic | [211] | |||
Ta2NiSe5 | monoclinic β=90.53 | [211] | |||
Ta2Ni2Te4 | [212] | ||||
Ta2Ni3Te5 | [212] |
Acid salts
Nickel hydrofluoride, H5NiF7·6H2O is made by using excess hydrofluoric acid solution on nickel carbonate. It is deep green.[3]
Basic salts
Nickel oxyfluoride Ni4F4O(OH)2 is green.[3]
Nickelous enneaoxydiiodide 9NiO•Nil2•15H2O forms when solutions of nickel iodide are exposed to air and evaporated.[3]
Complexes
Simple complexes of nickel include hexaquonickel(ii), yellow tetracyanonickelate [Ni(CN)4]2−, red pentacyanonickelate [Ni(CN)5]3− only found in solution, [Ni(SCN)4]2− and [Ni(SCN)6]4−. Halo- complexes include [NiCl4]2−, [NiF4]2−, [NiF6]4−, [NiCl2(H2O)4] [Ni(NH3)4(H2O)2]2+, [Ni(NH3)6]2+, [Ni(en)3)]2+.[16] Some complexes have fivefold coordination. N[CH2CH2NMe2]3 (tris(N,N-dimethyl-2-aminoethyl)amine); P(o-C6H4SMe)3; P(CH2CH2CH2AsMe2)3.[16]
Other ligands for octahedral coordination include PPh3, PPh2Me and thiourea.[16]
Nickel tetrahedral complexes are often bright blue and 20 times or more intensely coloured than the octahedral complexes.[16] The ligands can include selections of neutral amines, arsines, arsine oxides, phosphines or phosphine oxides and halogens.[16]
Bio molecules
Cofactor F430 contains nickel in a tetrapyrrole derivative, and is used in the production of methane. Some hydrogenase enzymes contain a nickel-iron cluster as an active site in which the nickel atom is held in place by cysteine or selenocysteine.[213] Plant ureases contain a bis-μ-hydroxo dimeric nickel cluster.[214] CO-methylating acetyl-CoA synthase contains two active nickel atoms, one is held in a square planar coordination by two cysteine and two amide groups, and the other nickel is held by three sulfur atoms. It is used to catalyse the reduction of carbon monoxide to acetyl-CoA.[215]
Nickel superoxide dismutase (or Ni-SOD) from Streptomyces contains six nickel atoms. The nickel holding is done by a "nickel binding hook" which as the amino acid pattern H2N-His-Cys-X-X-Pro-Cys-Gly-X-Tyr-rest of protein, where the bold bits are ligands for the nickel atom.[216]
Nickel transporter proteins exist to move nickel atoms in the cell. in E. coli these are termed NikA, NikB, NikC, NikD, NikE. In order to come through a cell membrane an nickel permease protein is used. In Alcaligenes eutrophus the gene for this is hoxN.[217]
Organometallics
Well known nickel organometalic (or organonickel) compounds include Nickelocene, bis(cyclooctadiene)nickel(0) and nickel tetracarbonyl. Nickel<name=Jolly/>[218]
Nickel tetracarbonyl was the first discovered organonickel compound. It was discovered that carbon monoxide corroded a nickel reaction chamber valve. And then that the gas coloured a bunsen burner flame green, and then that a nickel mirror condensed from heating the gas. The Mond process was thus inspired to purify nickel.[219] The Nickel tetracarbonyl molecule is tetrahedral, with a bond length for nickel to carbon of 1.82 Å.[219] Nickel tetracarbonyl easily starts breaking apart over 36° forming Ni(CO)3, Ni(CO)2, and Ni.[219] Ni(CO) and NiC appear in mass spectroscopy of nickel carbonyl.[219]
There are several nickel carbonyl cluster anions formed by reduction from nickel carbonyl. These are [Ni2(CO)5]2−, dark red [Ni3(CO)8]2−, [Ni4(CO)9]2−, [Ni5(CO)9]2−, [Ni6(CO)12]2−. Salts such as Cd[Ni4(CO)9] and Li2[Ni3(CO)8]•5acetone can be crystallised.[220]
Mixed cluster carbonyl anions like [Cr2Ni3(CO)16]2−, [Mo2Ni3(CO)16]2− and [W2Ni3(CO)16]2− [Mo<Ni4(CO)14]2− can form salts with bulky cations like tetraethylammonium. The brown [NiCo3(CO)11]− changes to red [Ni2Co4(CO)14]2−.[221]
With oxygen or air the explosive Ni(CO)3O2 can be formed from nickel carbonyl.[222]
Yet other ligands can substitute for carbon monoxide in nickel carbonyl. These lewis base ligands include triphenylphosphine, triphenoxyphosphine, trimethoxyphosphine, tributylphosphine, triethoxyphosphine, triethylisonitrolphosphine, triphenylarsine, and triphenylstibine.
Nickel forms dark blue planar complexes with l,2-Diimino-3,5-cyclohexadiene or bisacetylbisaniline [(C6H5N-C(CH3)=)2]2Ni. Another planar bis compound of nickel is formed with phenylazothioformamide C6H5N=NC(S)NR2, and dithizone C6H5N=NC(S)NHNHC6H5.[223] tetrasulfur tetranitride when reduced with nickel carbonyl makes Ni[N2S2H]2 also coloured dark violet.[223]
Alkoxy compounds
Nickel tert-butoxide Ni[OC(CH3)3]2 is coloured violet. It is formed in the reaction of di-tert-butylperoxide with nickel carbonyl.[219]
Nickel dimethoxide is coloured green.[224] There are also nickel chloride methoxides with formulae: NiClOMe, Ni3Cl2(OMe)4 and Ni3Cl(OMe)5 in which Nickel and oxygen appear to have a cubane structure.[225]
Other alkoxy compounds known for nickel include nickel dipropoxide, nickel di-isopropoxide, nickel tert-amyloxide, and nickel di-tert-hexanoxide.[226] These can be formed by crystallising nickel chloride from the corresponding alcohol, which forms an adduct. This is then heated with a base.[227] Nickel(II) alkoxy compounds are polymeric and non-volatile.[228]
Ziegler catalysis uses nickel as a catalyst. In addition it uses diethylaluminum ethoxide, phenylacetylene and triethylaluminium It converts ethylene into 1-butene. It can dimerise propylene. The catalyst, when combined with optically active phosphines, can produce optically active dimers. An intermediate formed is tris(ethylene)nickel.(CH2=CH2)3Ni in which the ethylene molecules connect to the nickel atom side on.[229]
Homoletptic bimetallic alkoxides have two different metals, and the same alkoxy group. They include Ni[(μ-OMe)3AlOMe]2, Ni[Al(OBut)4]2 (nickel tetra-tert-butoxyaluminate) and Ni[Al(OPri)4]2. (nickel tetra-isopropoxyaluminate a pink liquid)[230] Potassium hexaisoproxynoibate and tantalate can react with nickel clhoride to make Ni[Nb(OPri)6]2 and Ni[Ta(OPri)6]2. Ni[Zr2(OPri)9]2 The bimetallic alkoxides are volatile and can dissolve in organic solvents.[231] A trimetallic one exists [Zr2(OPri)9]Ni[Al(OPri)4].[232] NiGe(OBut)8], NiSn(OBut)8] and NiPb(OBut)8] are tricyclic. [Ni2μ3-OEt)2(μ-OEt)8Sb4(OEt)6]
Heteroleptic bitmetallic ethoxides have more than one variety of alkoxy group, e.g. Ni[(μ-OPri)(μ-OBut)Al(OBut)2]2 which is a purple solid.
Oxoalkoxides contain extra oxygen in addition to the alcohol. With only nickel, none are known, but with antimony an octanuclear molecule exists [Ni5Sb3(μ4-O)2(μ3-OEt)3(-OEt)9(OEt)3(EtOH)4].[233]
Aryloxy compounds
There are many nickel compounds with the formula template Ni(OAr)XL2 and Ni(OAr)2L2. L is a ligand with phosphorus or nitrogen atoms. OAr is a phenol group or O- attached to an aromatic ring. Often an extra molecule of the phenol is hydrogen bonded to the oxygen attached to nickel.[234]
μ-bonded molecules
Others include cyclododecatriene nickel,
Sulfur rings
Nickel bis-dithiobenzoate can form a violet coloured sodium salt.[219]
Two bisperfluoromethyl-l,2-dithietene molecules react with nickel carbonyl to make a double ring compound with nickel linked to four sulfur atoms. This contains four trifluoromethyl groups and is dark purple. Instead of this methyl or phenyl can substitute. These can be made by substituted acetylenes with sulfur on nickel carbonyl, or on nickel sulfide. Bis-diphenyldithiene nickel has a planar structure[235]
Nickel chalcogen cluster compound
A hexameric compound [Ni(SR)2]6 is produced in the reaction of nickel carbonyl with dialkyl sulfides (RSR).[235]
Nickel can be part of a cubane-type cluster with iron and chalcogens. The metal atoms are arranged in a tetrahedron shape, with the sulfur or selenium making up another tetrahedron that combines to make a cube. For example, the [NiFe3S4(PPh3)(SEt)3]2− is a dianion that has a tetraethyl ammonium salt. Similar ion clusters are [NiFe3Se4(PPh3)(SEt)3]2− and [NiFe3Se4(SEt)4]3−.[236] In the natural world cube shaped metal sulfur clusters can have sulfur atoms that are part of cysteine.
[Ni4Se23]4− has a cube with Ni(IV)4Se4 at its core, and then the nickel atoms are bridge across the cube faces by five Se3 chains and one Se4 chain. It is formed as a tetraethylammonium salt, from Li2Se, Se, NEt4Cl and nickel dixanthate in dimethylformamide as a solvent. This reaction also produces (NEt4)2Ni(Se4)2.[237]
Nitrosyl compounds
When liquid nickel carbonyl is dissolved in liquid hydrogen chloride, it can react with nitrosyl chloride to form a dimer Ni(NOCl)2. This then decomposes to Ni(NO)Cl2, which is polymeric.[219]
Nickel carbonyl reacting with nitric oxide yields blue coloured mononitrosyl nickel NiNO. With cyclohexane as well, pale blue Ni(NO2)NO is produced with nitrous oxide as a side product. With cyclopentadiene as well, π-C5H5NiNO is produced.[219]
References
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- ↑ Popescu, M. A. Non-Crystalline Chalcogenicides. Springer Science & Business Media. p. 73. ISBN 9781402003592.
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- 1 2 Tremel, Wolfgang (July 1991). "Isolated and Condensed Ta2Ni2 Clusters in the Layered Tellurides Ta2Ni2Te4 and Ta2Ni3Te5". Angewandte Chemie International Edition in English. 30 (7): 840–843. doi:10.1002/anie.199108401.
- ↑ Greening, C.; Berney, M.; Hards, K.; Cook, G. M.; Conrad, R. (3 March 2014). "A soil actinobacterium scavenges atmospheric H2 using two membrane-associated, oxygen-dependent [NiFe] hydrogenases". Proceedings of the National Academy of Sciences. 111 (11): 4257–4261. doi:10.1073/pnas.1320586111.
- ↑ Karplus PA, Pearson MA, Hausinger RP (1997). "70 years of crystalline urease: What have we learned?". Accounts of Chemical Research. 30 (8): 330–337.
- ↑ EVANS, D (August 2005). "Chemistry relating to the nickel enzymes CODH and ACS". Coordination Chemistry Reviews. 249 (15-16): 1582–1595. doi:10.1016/j.ccr.2004.09.012.
- ↑ Wuerges, J.; Lee, J.-W.; Yim, Y.-I.; Yim, H.-S.; Kang, S.-O.; Carugo, K. D. (1 June 2004). "Crystal structure of nickel-containing superoxide dismutase reveals another type of active site". Proceedings of the National Academy of Sciences. 101 (23): 8569–8574. doi:10.1073/pnas.0308514101.
- ↑ Cammack, Richard; Vliet, Pieter (1999). "Catalysis by Nickel in Biological Systems". In Reedijk, Jan; Bouwman, Elisabeth. Bioinorganic Catalysis (2 ed.). New York: Marcel Dekker. p. 233. ISBN 0-8247-0241-7.
- ↑ Jolly, P. W.; Wilke, G. (1975). The organic chemistry of nickel. 2. New York: Academic Press. ISBN 0-12-388402-0.
- 1 2 3 4 5 6 7 8 Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. pp. 1–9. ISBN 0-12-388401-2.
- ↑ Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. pp. 20–22. ISBN 0-12-388401-2.
- ↑ Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. pp. 23–24. ISBN 0-12-388401-2.
- ↑ Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. p. 16. ISBN 0-12-388401-2.
- 1 2 Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. p. 19. ISBN 0-12-388401-2.
- ↑ Bradley], D.C. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 97. ISBN 0-12-124140-8.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 100. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 11. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 19. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 68. ISBN 978-0-12-124140-7.
- ↑ Jolly, P. W.; Wilke, G. (1975). The organic chemistry of nickel. 2. New York: Academic Press. p. 3. ISBN 0-12-388402-0.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. p. 208. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. pp. 185–192. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. pp. 215–216. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. pp. 432–433. ISBN 978-0-12-124140-7.
- ↑ Bradley, Don C.; Mehrotra, R. C.; Rothwell, Ian; Sin, A. (2001). Alkoxo and aryloxo derivatives of metals. San Diego: Academic Press. pp. 619–621. ISBN 978-0-12-124140-7.
- 1 2 Jolly, P. W.; Wilke, G. (1974). The organic chemistry of nickel. 1. New York: Academic Press. pp. 18–19. ISBN 0-12-388401-2.
- ↑ Ciurli, Stefano; Ross, Paul K.; Scott, Michael J.; Yu, Shi Bao; Holm, R. H. (June 1992). "Synthetic nickel-containing heterometal cubane-type clusters with NiFe3Q4 cores (Q=sulfur, selenium)". Journal of the American Chemical Society. 114 (13): 5415–5423. doi:10.1021/ja00039a063.
- ↑ McConnachie, Jonathan M.; Ansari, Mohammad A.; Ibers, James A. (August 1991). "Synthesis and characterization of nickel chalcogenide [Ni4Se4(Se3)5(Se4)]4- anion, a Ni(IV) cubane species". Journal of the American Chemical Society. 113 (18): 7078–7079. doi:10.1021/ja00018a079.
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