Investigations on metal-metal interactions in some transitional metal complexes at high pressures

Abstract

The electrical semiconducting properties of barium tetracyanoplatinate(II) tetrahydrate, and of tetrammineplatinum(II) tetrachloroplatinate(II)-Magnus' Green Salt, have been studied at temperatures in the range 293–465°K and pressures up to 47 kbar. The thermal excitation energies lie in the region 0·15–0·45 eV and, for these compounds, decrease by about 0·1 eV on application of pressures to 47 kbar. The relations of optical and thermal excitation processes are discussed, and it is concluded that no evidence has yet appeared to indicate any significant extent of direct d− d bonding interactions between adjacent Pt atoms in such complexes.