Rhenium(IV) chloride

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Names Identifiers Unit cell of Rhenium(IV) chloride. Other names rhenium tetrachloride 3D model (JSmol) ChemSpider ECHA InfoCard 100.033.612 PubChem CID PubChem has incorrect charge balance CompTox Dashboard (EPA) InChI=1S/4Cl.ReKey: YPYBYMCXDNTAKJ-UHFFFAOYSA-N [Cl-].[Cl-].[Cl-].[Cl-].[Re+4] Cl4Re Molar mass 328.01 g·mol−1 Appearance black solid Density 4.5 g·cm−3 (β) Primitve monoclinic P2/c, No. 13 a = 636.2 pm, b = 627.3 pm, c = 1216.5 pmα = 90°, β = 93.15°, γ = 90° [1] 4 Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Rhenium(IV) chloride is the inorganic compound with the formula ReCl4. This black solid is of interest as a binary phase but otherwise is of little practical value. A second polymorph of ReCl4 is also known. [1]

Preparation

ReCl4 can be prepared by comproportionation of rhenium(V) chloride and rhenium(III) chloride. It can also be produced by reduction of rhenium(V) chloride with antimony trichloride. [2]

${\displaystyle \mathrm {2\ ReCl_{5}+SbCl_{3}\longrightarrow 2\ ReCl_{4}+SbCl_{5}} }$

Tetrachloroethylene at 120 °C is also effective as a reductant:

${\displaystyle \mathrm {2\ ReCl_{5}+C_{2}Cl_{4}\longrightarrow 2\ ReCl_{4}+C_{2}Cl_{6}} }$

Structure

X-ray crystallography reveals a polymeric structure. The Re–Re bonding distance is 2.728 Å. Re centers are octahedral, being surrounded by six chloride ligands. Pairs of octahedra share faces. The Re2Cl9 subunits are linked by bridging chloride ligands. The structural motif - corner-shared bioctahedra - is unusual in the binary metal halides. [1]

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References

1. Cotton, F. A.; DeBoer, B. G.; Mester, Z. (1973). "Chemistry of Rhenium(IV) Chloride. II. Structure of One of the Polymorphs (β) and Evidence for a New Polymorph (γ)". Journal of the American Chemical Society. 95 (4): 1159–1163. doi:10.1021/ja00785a027.CS1 maint: uses authors parameter (link)
2. Erwin Riedel, Christoph Janiak (2011). Anorganische Chemie. Walter de Gruyter. ISBN   978-311022567-9.CS1 maint: uses authors parameter (link)