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Pressure‐Induced Phase Transition in Mixed‐Valence Gold Complexes: Comparison of Quasi‐1D System with 3D System
Author(s) -
Liu X.J.,
Moritomo Y.,
Nakamura A.,
Matsuba S.,
Kojima N.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200101)223:1<183::aid-pssb183>3.0.co;2-v
Subject(s) - valence (chemistry) , raman spectroscopy , hydrostatic pressure , ion , chemistry , phase transition , crystallography , analytical chemistry (journal) , materials science , condensed matter physics , thermodynamics , physics , optics , organic chemistry , chromatography
Abstract Effects of hydrostatic pressure on Raman spectra have been investigated in mixed‐valence (MV) gold complexes, i.e., quasi‐one‐dimensional (quasi‐1D) [AuX(DBS)][AuX 3 (DBS)] (X = Br and Cl, DBS = dibenzylsulfide) and three‐dimensional (3D) Cs 2 Au 2 X 6 (X = Cl and Br) up to ∼13 GPa at 300 K. We have observed the deactivation of a Raman‐active Au–X stretching mode under a critical pressure of P c ∼ 8 GPa (∼17 GPa) for X = Br (X = Cl) in quasi‐1D complexes, indicating a pressure‐induced phase transition from the MV state to a single‐valence (SV) state. The larger P c value, as compared to the P c ∼ 7 GPa (∼11 GPa) for the 3D complex, is perhaps due to the larger relative displacement of the halogen ions in the quasi‐1D system.