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

Abstract

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.