Silver thiocyanate

Silver thiocyanate
Names
IUPAC name
Silver(I) thiocyanate, Silver thiocyanate
Other names
Thiocyanic acid, silver (1+) thiocyanate; Silver isothiocyanate; Silver sulphocyanide[1]
Identifiers
1701-93-5 Yes
ChemSpider 66941 Yes
EC number 216-934-9
Jmol-3D images Image
PubChem 74345
UNII S44O8TME5U Yes
UN number 3077
Properties
Molecular formula
 CAgNS
Molar mass 165.95 g·mol−1
Appearance Colorless crystals
Odor Odorless
Melting point 170 °C (338 °F; 443 K)
decomposes[2]
0.14 mg/L (19.96 °C)
0.25 mg/L (21 °C)
6.68 mg/L (100 °C)[1]
1.03·10−12[3]
Solubility Insoluble in acids (reacts)[4] except when concentrated, acetates, aq. nitrates[1]
Solubility in silver nitrate 43.2 mg/L (25.2 °C, 3 nAgNO3/H2O)[1]
Solubility in sulfur dioxide 14 mg/kg (0 °C)[2]
Solubility in methanol 0.0022 mg/kg[2]
−6.18·10−5 cm3/mol[3]
Structure
Crystal structure Monoclinic, mS32 (293 K)[5]
Space group C2/c, No. 15 (293 K)[5]
Point group 2/m (293 K)[5]
Lattice constant a = 8.792(5) Å, b = 7.998(5) Å, c = 8.207(5) Å (293 K)[5]
Lattice constant α = 90°, β = 93.75(1)°, γ = 90°
Thermochemistry
Specific
heat capacity (C)
 63 J/mol·K[2]
131 J/mol·K[2]
Std enthalpy of
formation (ΔfHo298)
 88 kJ/mol[2]
Hazards
GHS pictograms [4]
GHS signal word Warning
H302, H312, H332, H410[4]
P273, P280, P501[4]
EU classification Xn N
R-phrases R20/21/22, R32, R50/53
S-phrases S13, S36/37, S46, S60, S61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Silver thiocyanate is a silver salt of thiocyanic acid with the formula AgSCN.

Structure

AgSCN is monoclinic with 8 molecules in the cell. The SCN− groups has an almost linear molecular geometry, with bond angle 179.6(5)°. Weak Ag—Ag interactions length are 0.3249(2) nm to 0.3338(2) nm which forming one-dimensional zig-zag chain in AgSCN.[5]

Production

Silver thiocyanate is produced by the reaction between silver nitrate and potassium thiocyanate.

References

  1. ↑ 1.0 1.1 1.2 1.3 Comey, Arthur Messinger; Hahn, Dorothy A. (1921-02). A Dictionary of Chemical Solubilities: Inorganic (2nd ed.). New York: The MacMillan Company. p. 884. Check date values in: |date= (help)
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anatolievich, Kiper Ruslan. "silver thiocyanate". http://chemister.ru''. Retrieved 2014-07-19.
  3. ↑ 3.0 3.1 Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
  4. ↑ 4.0 4.1 4.2 4.3 Sigma-Aldrich Co., Silver thiocyanate. Retrieved on 2014-07-19.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Zhu, H.-L.; Liu, G.-F.; Meng, F.-J. (2003). "Refinement of the crystal structure of silver(I) thiocyanate, AgSCN". Zeitschrift für Kristallographie - New Crystal Structures (München: Oldenbourg Wissenschaftsverlag GmbH) 218 (JG): 263–264. doi:10.1524/ncrs.2003.218.jg.285. ISSN 2197-4578.