Abstract
The Raman spectrum of single crystals of the mercury halide complex trimethylsulphonium trichloromercurate (II) has been studied in the pressure range 0–12 GPa and at room temperature. A continuous reversible phase change is observed at about 1.2 GPa and is accompanied by a major molecular rearrangement. This is interpreted as a pressure induced stereochemical change involving the increase of the coordination number of the mercury atom bound to chlorine ligand from the planar trigonal to the tetrahedral or pseudotetrahedral structure. A mechanism of the interconversion of the two coordination mercury (II) halide complexes is proposed.
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