Abstract
Pressure effects on Raman spectra have been investigated in quasi-one-dimensional (quasi-1D) mixed-valence (MV) gold complexes [Au X (DBS)][Au X 3 (DBS)] ( X = Br and Cl, DBS=dibenzylsulfide) at 300 K. We have observed pressure-induced deactivation of a Raman-active Au- X stretching mode, indicating a pressure-induced phase transition from the MV state to a single-valence (SV) state. The critical pressure P c for the phase transition increases from ∼8 GPa for X = Br to ∼17 GPa for X = Cl, perhaps due to the enhanced displacement of halogen ions from the central position.
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