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Rhenium trichloride

Rhenium Trichloride
.^[1]
General
Systematic name	Rhenium(III) chloride
Other names	Rhenium trichloride
Molecular formula	ReCl₃
Molar mass	292.57 g/mol
Appearance	red, crystalline, nonvolatile solid
CAS number	[13569-63-6]
Properties
Density and phase	4800 kg/m³
Solubility in water	hydrolyzes to form Re₂O₃^.xH₂O.
In acetone In methanol In acetic acid	Soluble Soluble Soluble
Melting point	N/A
Boiling point	500 °C (decomposes)
Structure
Molecular shape	(trimeric solid and in solution) (dimeric in acetic acid)
Coordination geometry	Octahedral
Crystal structure	Double Layered Rhombohedral
Dipole moment	? D
Hazards
MSDS	External MSDS
Main hazards	Corrosive (C)
NFPA 704	0 4 1
Flash point	N/A
R/S statement	R: R20 R21 R22 R23 R36 R37 R38 S: S3 S7 S8 S22 S24 S25 S26 S27 S28 S30 S41 S63
RTECS number	?
Supplementary data
Structure and properties	n, ε_r, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	Rhenium tribromide Rhenium triiodide
Other cations	Rhenium pentachloride Technetium trichloride
Related compounds
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Rhenium trichloride (ReCl₃) is a compound of rhenium and chlorine.

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History

Rhenium trichloride was first discovered in 1932 by Geilnann, Wriuce, and Biltz. ^[2]

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 C_3v symmetry.^[1]

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. ^[3]

Chemical properties

Rhenium trichloride prepared from rhenium pentachloride without further treatment is chemically reactive, but if it is vacuum sublimed at 500 ^oC, then it becomes comparatively unreactive. However, x-ray diffraction tests show no observable difference in structure between the untreated and vacuum sublimed material.^[3]

The heat of oxidation according to the equation,
ReCl₃(s) + 4OH^- + 2OCl^- --> ReO₄^- + 2H₂O + 5Cl^-
is 190.7 ± 0.2 kcal/mol.^[3]

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 aluminum chloride, the thermal decomposition of salts of hexachlororhenic(IV) acid,^[3] or the heating of Re₂(O₂CCH₃)₄Cl₂ under HCl gas.^[4]

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.^[5]

References

^ ^a ^b Cotton, F. A.; Mague J. T. Inorg. Chem. 1964, 233
^ Geilnann, W.; Wriuce, F. W.; Biltz. W.: Nachr. Ges. Wiss. Gottingen 1932, 579.
^ ^a ^b ^c ^d Colton, R. Chemistry of rhenium and technetium. London: Interscience Publishers. 1965.
^ Lincoln R.; Wilkinson, G.: Inorg. Synth. 1980, 20, 44
^ Hamon, J-R, Astruc, D., Organomet., 1989, 8(9), 2243-2247.

Categories: Rhenium compounds | Chlorides

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rhenium_trichloride". A list of authors is available in Wikipedia.