Vibrational and nuclear magnetic resonance spectroscopic studies on some carbonyl complexes of gold, palladium, platinum, rhodium, and iridium

Detailed i.r. and Raman studies are reported for [AuCl(CO)], [PtX3(CO)]–(X = Cl, Br, or I), [PdX3(CO)]–, cis-[PtX2(CO)2], cis-[RhX2(CO)2]–(X = Cl or Br), and cis-[IrCl2(CO)2]– together with assignments. Skeletal stretching wavenumbers are reported for cis-[PtX2(CO)(PMe3)](X = Cl, Br, or I), trans-[PtX(CO)(PMe3)2]+, trans-[RhX(CO)(PMe3)2](X = Cl or Br), and [RhCl3(CO)(PMe3)2]. The results of 13C n.m.r. studies on the carbony complexes are reported together with those from 1H n.m.r. and 1H-{31p} and 1H-{195Pt} INDOR spectroscopy on the phosphine-containing complexes. The 195Pt chemical shifts of [PtX3(CO)]– from direct measurements are reported. The results are discussed with the assistance of stretching force constants for some of the simpler complexes.