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Studies of mixed-valence states in three-dimensional halogen-bridged gold compounds, Cs2Au I Au III X6, (X = Cl, Br or I). Part 2. X-Ray photoelectron spectroscopic study

1991; Royal Society of Chemistry; Issue: 11 Linguagem: Inglês

10.1039/dt9910003121

2050-5671

Hiroshi Kitagawa, Norimichi Kojima, Tsuyoshi Nakajima,

Organic and Molecular Conductors Research

The mixed-valence states in Cs2AuIAuIIIX6(X = Cl, Br or I) were systematically studied by X-ray photoelectron spectroscopy of the Au 4f region for the first time. The gold valence states in halogeno complexes of AuI and AuIII were also studied. In Cs2Au2X6 the difference between the oxidation state of AuI and that of AuIII decreases as the covalency of the –AuI–X–AuIII–X– bonds increases in the order X = Cl < Br < I, because the charge-transfer interaction between AuI and AuIII through the bridging halogen becomes stronger in this order. In the non-stoichiometric CsAu0.6Br2.6 the oxidation state of Au is considered to be almost homogeneous.