Multinuclear nuclear magnetic resonance studies of trimethylplatinum(IV) complexes with organochalcogen ligands

Abstract

New preparative procedures have been developed for the formation of the platinum(IV) complexes [PtXMe₃{MeE(CH₂)_nE′Me}](X = Cl, Br, or l; n= 2 or 3; E,E′= S or Se), and ¹⁹⁵Pt, ⁷⁷Se, and ¹³C n.m.r. data obtained. Deductions on the relative stabilities of the complexes with varying ring size and chalcogen have been made on the basis of the values of ¹J(PtC) and ¹J(PtSe). These deductions are supported by chemical evidence. Correlations exist between ¹⁹⁵Pt chemical shifts and the strength of the Pt–Se bond, with weaker bonds leading to greater deshielding at the Pt nucleus.