STRUCTURAL TRANS EFFECT IN TRANS-[PTMEX(PPH(3))(2)] COMPLEXES - A COMPARATIVE H-1-NMR STUDY AND THE CRYSTAL-STRUCTURE OF TRANS-[PTMECL(PPH(3))(2)]

A series of complexes of the type trans-[PtMeX(PPh(3))(2)] was investi gated by means of LH NMR spectroscopy. Correlations were obtained for the chemical shifts and coupling constants of the methyl proton resona nces as a function of the nucleophilic reactivity constants and the re lative structural trans effect of the different X ligands. The X-ray c rystal structure of one of the complexes in the series, trans-[PtMeCl( PPh(3))(2)], was determined. The compound crystallized as a 50% disord ered structure in the triclinic space group P (1) over bar with a = 9. 225(2), b = 9.625(2). c = 10.415(2) Angstrom, alpha = 72.52(2), beta = 91.95(2), gamma = 112.08(2)' and Z = 1. The structure was refined to R = 0.022 for 2874 independent reflections. The structural trans effec t of the methyl group is compared with literature data for similar com plexes.