Gold(I,III) chloride

Names
Systematic IUPAC name

tetra-μ-chlorotetrachlorotetragold

Other names

Mixed gold chloride, Tetragold octachloride

Identifiers

CAS Number

* 62792-24-9 Y

3D model (JSmol)

* Interactive image
* Interactive image

PubChem CID

* 139092506

InChI

* InChI=1S/4Au.4ClH.4Cl/h;;;;4*1H;;;;/q;;2*+2;;;;;;;;/p-4 N

Key: NWBJVUUFMJPGPV-UHFFFAOYSA-J N

SMILES

* Cl[Au]1(Cl)[Cl][Au][Cl][Au](Cl)(Cl)[Cl][Au][Cl]1

* [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Au+].[Au+].[Au+3].[Au+3]

Properties

Chemical formula

| Au4Cl8
Molar mass | 1071.490 g mol−1
Appearance  | black crystals

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)
Infobox references

Gold(I,III) chloride is a black solid with the chemical formula Au4Cl8. It is an example of a mixed valence compound as it contains gold in two different oxidation states; square-planar gold(III) and almost linear gold(I). The compound is photosensitive as well as air- and moisture-sensitive.

## Synthesis

Gold(I,III) chloride may be prepared by the reaction of gold(III) chloride with gold carbonyl chloride[1] or carbon monoxide[2] at room temperature in thionyl chloride.

Au2(CO)Cl4 \+ Au2Cl6 → COCl2 \+ Au4Cl8

2 Au2Cl6 \+ 2 CO → Au4Cl8 \+ 2 COCl2

## Structure and properties

Single crystals of gold(I,III) chloride are triclinic with a P1 space group and consist of discrete Au4Cl8 molecules with idealised C2h symmetry.[1] Within this the Au(I) centers are linearly coordinated with a Cl-Au-Cl bond angle of 175.0° (close to the ideal value of 180°) and an average bond length of 2.30 Å. The Au(III) centers adopt a slightly irregular square-planar conformation with the Au-Cl bond lengths for bridging chlorides (2.33 Å) being slightly longer than those of terminal chlorides (2.24 Å).

## References

1. ↑ 1.0 1.1 Dell'Amico, Daniela Belli; Calderazzo, Fausto; Marchetti, Fabio; Merlino, Stefano; Perego, Giovanni (1977). "X-Ray crystal and molecular structure of Au4Cl8, the product of the reduction of Au2Cl6 by Au(CO)Cl". Journal of the Chemical Society, Chemical Communications (1): 31. doi:10.1039/C39770000031.
2. ↑ Dell'Amico, Daniela Belli; Calderazzo, Fausto; Marchetti, Fabio; Merlino, Stefano (1982). "Synthesis and molecular structure of [Au4Cl8], and the isolation of [Pt(CO)Cl5]− in thionyl chloride". Journal of the Chemical Society, Dalton Transactions (11): 2257. doi:10.1039/DT9820002257.

* v
* t
* e

Gold compounds

Gold(-I)|

* CsAu
* RbAu

Gold(I)|

* AuBr
* AuCl
* AuI
* AuOH
* Au2S
* Na3Au(S2O3)2

| Organogold(I) compounds|

* (AuC6H2(CH3)3)5
* (C2H5)3PAuSC5H5O(CO2CH3)3CH2OCOCH3
* AuSC5H5O(OH)3CH2OH
* NaAuSCH2CHOHCH2SO3
* BrAuSC4H8
* ClAuSC4H8
* ClAuS(CH3)2
* ClAuP(C6H5)3
* Na2AuSCHCO2CH2CO2
* NaAuSCHCO2CH2CO2H

|

Gold(II)|

* AuXe4(Sb2F11)2

Gold(I,III)|

* Au4Cl8

Gold(III)|

* HAuCl4
* HAuBr4
* AuBr3
* AuCl3
* AuF3
* Au2O3
* Au(OH)3
* Au2S3

Gold(V)|

* AuF5
* AuF5·F2
* Au2(C2O4)5

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