Gold halide

Gold halide

Gold halides are compounds of gold with the halogens.

Monohalides

AuCl, AuBr, and AuI are all crystalline solids with a structure containing alternating linear chains: ..-X-Au-X-Au-X-Au-X-... The X-Au-X angle is 180°.Fact|date=February 2007

The monomeric AuF molecule has been detected in the gas phase [cite journal | author = D. Schröder, J. Hrušák, I. C. Tornieporth-Oetting, T. M. Klapötke and H. Schwarz | title = Neutral Gold(I) Fluoride Does Indeed Exist | year = 1994 | journal = Angewandte Chemie International Edition in English | volume = 33 | issue = 2 | pages = 212–214 | doi = 10.1002/anie.199402121 ] .

Trihalides

The triiodide does not exist.Fact|date=February 2007 AuCl3 readily forms out of the elements at temperatures below 254 °C. It is a volatile red solid. The volatile species is the dimer Au2Cl6.Fact|date=February 2007. Likewise, AuBr3 can be formed from the elements and exists primarily as the dimer Au2Br6.

Gold(III) fluoride, AuF3, has a unique polymeric helical structure, containing corner-sharing {AuF4} squares.

Pentahalides

Gold(V) fluoride, AuF5, is the only known example of gold in the +5 oxidation state. It most commonly occurs as the dimer Au2F10.

References


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