Rhenium(IV) chloride

Rhenium(IV) chloride
	; Unit cell of Rhenium(IV) chloride.
Names
	Other names rhenium tetrachloride
Identifiers
CAS Number	13569-71-6;
3D model (JSmol)	Interactive image;
ChemSpider	75414;
ECHA InfoCard	100.033.612
PubChem CID	18469522 PubChem has incorrect charge balance;
CompTox Dashboard (EPA)	DTXSID7065540 ;
	InChI InChI=1S/4Cl.Re Key: YPYBYMCXDNTAKJ-UHFFFAOYSA-N;
	SMILES [Cl-].[Cl-].[Cl-].[Cl-].[Re+4];
Properties
Chemical formula	Cl4Re
Molar mass	328.01 g·mol−1
Appearance	black solid
Density	4.5 g·cm−3 (β)
Structure[1]
Crystal structure	Primitve monoclinic
Space group	P2/c, No. 13
Lattice constant	a = 636.2 pm, b = 627.3 pm, c = 1216.5 pm α = 90°, β = 93.15°, γ = 90°[1]
Formula units (Z)	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]

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

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

\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]

References

Cotton FA, DeBoer BG, 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.
Erwin Riedel; Christoph Janiak (2011). Anorganische Chemie. Walter de Gruyter. ISBN 978-311022567-9.

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[FAC-1] Cotton FA, DeBoer BG, 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.

[Erwin_Riedel,_Christoph_Janiak-2] Erwin Riedel; Christoph Janiak (2011). Anorganische Chemie. Walter de Gruyter. ISBN 978-311022567-9.