Rhenium trichloride
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| Rhenium trichloride | |
|---|---|
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| IUPAC name | Rhenium(III) chloride |
| Other names | Rhenium trichloride |
| Identifiers | |
| CAS number | [13569-63-6] |
| Properties | |
| Molecular formula | ReCl3 |
| Molar mass | 292.57 g/mol |
| Appearance | red, crystalline, nonvolatile solid |
| Density | 4800 kg/m³ |
| Melting point |
N/A |
| Boiling point |
500 °C (decomposes) |
| Solubility in water | hydrolyzes to form Re2O3.xH2O. |
| Structure | |
| Crystal structure | Double Layered Rhombohedral |
| Coordination geometry |
Octahedral |
| Molecular shape | (trimeric solid and in solution) (dimeric in acetic acid) |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | Corrosive (C) |
| Related compounds | |
| Other anions | Rhenium tribromide Rhenium triiodide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Rhenium trichloride (ReCl3) is a compound of rhenium and chlorine. It was first discovered in 1932 by Geilnann, Wriuce, and Biltz.[1]
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[edit] Structure and physical properties
The crystal structure of rhenium trichloride consists of well-defined Re3Cl9 units that are connected by chlorine atom bridges. The Re3Cl9 unit structure also applies to rhenium trichloride dissolved in a variety of solvents, with the only possible exception being the dimer structure when dissolved in acetic acid. The Re3Cl9 crystal structure has C3v symmetry.[2]
Rhenium trichloride is comparatively non-volatile but produces a green vapour during strong heating. It may have a very small temperature-independent paramagnetism, but the susceptibility is ambiguous.[2]
[edit] Chemical properties
Rhenium trichloride prepared from rhenium pentachloride without further treatment is chemically reactive, but if it is vacuum sublimed at 500oC, then it becomes comparatively unreactive. However, x-ray diffraction tests show no observable difference in structure between the untreated and vacuum sublimed material.[2]
The heat of oxidation according to the equation,
ReCl3(s) + 4OH- + 2OCl- --> ReO4- + 2H2O + 5Cl-
is 190.7 ± 0.2 kcal/mol.[2]
[edit] Preparation
Rhenium trichloride is most efficiently prepared by the thermal decomposition of rhenium pentachloride in nitrogen. Other methods include reacting sulphuryl chloride with rhenium powder with or without the addition of aluminium chloride, the thermal decomposition of salts of hexachlororhenic(IV) acid,[2] or the heating of Re2(O2CCH3)4Cl2 under HCl gas.[3]
[edit] Uses
Rhenium trichloride is used as a starting material for synthesis of rhenium complexes. ReCl3 can react with peralkylated benzene-metal complexes that act as electron reservoirs.[4]
[edit] References
- ^ Geilnann, W.; Wriuce, F. W.; Biltz. W.: Nachr. Ges. Wiss. Gottingen 1932, 579.
- ^ a b c d e Colton, R. Chemistry of rhenium and technetium. London: Interscience Publishers. 1965.
- ^ Lincoln R.; Wilkinson, G. (1980). "Trirhenium Nonachloride". Inorg. Synth. 20: 44. doi:.
- ^ Hamon, J-R, Astruc, D. (1989). "Organometallic electron reservoirs. 38. Influence of steric bulk on Fischer-type syntheses of peralkylated electron-reservoir sandwiches [FeCp*(arene)]+: cleavage of alkyl groups and mechanistic implications". Organometallics 8 (9): 2243–2247. doi:.
