Trirhenium nonachloride

Trirhenium nonachloride
Names
IUPAC name
Rhenium(III) chloride
Other names
Rhenium trichloride
Identifiers
13569-63-6 YesY
EC Number 236-987-1
Jmol interactive 3D Image
PubChem 83581
Properties
ReCl3
Molar mass 292.57 g/mol
Appearance red, crystalline, nonvolatile solid
Density 4800 kg/m3
Melting point N/A
Boiling point 500 °C (932 °F; 773 K) (decomposes)
hydrolyzes to form Re2O3.xH2O.
Structure
Rhombohedral, hR72
R-3m, No. 166
(trimeric solid and in solution)
(dimeric in acetic acid)
Hazards
Main hazards Corrosive (C)
Safety data sheet External MSDS
Related compounds
Other anions
Rhenium tribromide
Rhenium triiodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Trirhenium nonachloride (Re3Cl9) is a compound of rhenium and chlorine. It was first discovered in 1932 by Geilnann, Wriuce, and Biltz.[1]

Structure and physical properties

The structure of trirhenium nonachloride consists of well-defined Re3Cl9 units that are connected by chloride bridges.[2]

Chemical properties

trirhenium nonachloride prepared from rhenium pentachloride without further treatment is chemically reactive, e.g. for producing adducts. If however the sample is vacuum sublimed at 500 °C, the resulting material comparatively unreactive. However, x-ray diffraction tests show no difference in structure between the untreated and vacuum-sublimed material.[2]

The heat of oxidation is evaluated according to the equation:

1/3 Re3Cl9 + 4 OH + 2 OCl ReO4 + 2 H2O + 5Cl

The enthalpy for this process is 190.7 ± 0.2 kcal/mol.[2]

Preparation

Trirhenium nonachloride is most efficiently prepared by thermal decomposition of rhenium pentachloride or hexachlororhenic(IV) acid. Other methods include treating rhenium with sulfuryl chloride. This process is sometimes conducted with the addition of aluminium chloride.[2] Heating Re2(O2CCH3)4Cl2 under HCl.[3]

3/2 Re2(O2CCH3)4Cl2 + 6 HCl → Re3Cl9 + 6 HO2CCH3

Uses

Trirhenium nonachloride is used as a starting material for synthesis of many rhenium complexes[4]

References

  1. Geilnann, W.; Wriuce, F. W.; Biltz. W.: Nachr. Ges. Wiss. Gottingen 1932, 579.
  2. 1 2 3 4 Colton, R. Chemistry of rhenium and technetium. 965.
  3. Lincoln R.; Wilkinson, G. (1980). "Trirhenium Nonachloride". Inorg. Synth. Inorganic Syntheses 20: 44. doi:10.1002/9780470132517.ch12. ISBN 978-0-470-13251-7.
  4. 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:10.1021/om00111a022.
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