Vibrational spectra and force field studies of [PtCl3(CO)]− anion labelled with 13C16O, 12C18O, and radioactive 14C16O

Detailed infrared and Raman studies are reported for [PtCl3(12C16O)]−, [PtCl3(13C16O)]−, [PtCl3(12C18O)]−, and [PtCl3(14C16O)]− together with assignments. Bands observed for the 14C16O species at 2005, 483, 507, and 466 cm−1 are assigned to CO and PtC stretching, PtCO in-plane and out-of-plane linear bending modes, respectively. Force constants have been calculated using a modified valence force field, with constrained off-diagonal force constants based on [PtCl4]2− and [PtX3(CO)]− (X = Br, I). The effective G-matrix method (EGM) has been used for approximate calculation of CO and PtC stretching force constants for some other square-planar platinum–carbonyl complexes. The results are discussed with the assistance of stretching force constants for some of the simpler complexes.