Spectroscopic studies on some new cationic complexes of platinum(II)

Abstract

The preparation of some new cationic platinum complexes of general formula PtXL(PEt₃)₂⁺ ClO₄^–[L = py, PEt₃, PPh₃, P(OMe)₃, P(OPh)₃, CN·C₆H₄·OMe, CN·CMe₃, Co; X = H, Cl, Br, m-FC₆H₄, p-FC₆H₄] is described. The i.r. and n.m.r. spectra of these complexes are presented and discussed. The ligands L can be arranged in a series of increasing ‘trans-influence’, defined as the ability of a ligand to weaken the bond trans to itself. The importance of σ-effects in determining the order in this series and in considering the value of a ‘π-acceptor series’ based on the ¹⁹F n.m.r. spectra is discussed.