Infrared and Raman spectra of single crystals of Magnus' green salt, tetra-ammineplatinum(II) tetrachloroplatinate(II)

Abstract

The symmetry species of almost all the i.r. and Raman-active vibrations of Magnus' green salt. [Pt(NH₃)₄][PtCl₄], have been determined from experiments with oriented single crystals. An assignment is proposed, the most important feature being that the A_2u lattice mode of the cation–anion chain is placed at 81 and not at 201 cm^–1 as was previously suggested. The latter band is attributed to NH₃ torsional motion.