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;
PubChem CID	18469522 PubChem has incorrect charge balance;
	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)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

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}} 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]

[math]\displaystyle{ \mathrm{2 \ ReCl_5 + SbCl_3 \longrightarrow 2 \ ReCl_4 + SbCl_5} }[/math]

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

[math]\displaystyle{ \mathrm{2 \ ReCl_5 + C_2Cl_4 \longrightarrow 2 \ ReCl_4 + C_2Cl_6} }[/math]

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

↑ ^1.0 ^1.1 ^1.2 Cite error: Invalid <ref> tag; no text was provided for refs named FAC
↑ Erwin Riedel; Christoph Janiak (2011). Anorganische Chemie. Walter de Gruyter. ISBN 978-311022567-9.

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[FAC-1] 1.0 ^1.1 ^1.2 Cite error: Invalid <ref> tag; no text was provided for refs named FAC

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

Names
Unit cell of Rhenium(IV) chloride.
Other names rhenium tetrachloride
Identifiers
CAS Number	13569-71-6
3D model (JSmol)	Interactive image
ChemSpider	75414
PubChem CID	18469522 PubChem has incorrect charge balance
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)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references