Synthesis of the first sulphur-containing platinum(ii) alkenylarylalkynyl complexes by photoirradiation

Abstract

A new synthetic route has been developed to construct a new series of sulphur-containing trans-platinum(II) alkenylarylalkynyl complexes with general formula trans-[(PR₃)₂–Pt–{CC–Ar–CHCH(SPh)}₂], (where R = ethyl and Ar = phenylene 2a, biphenylene 2b, 2,5-dimethylphenylene 2c, and 2,5-dimethoxyphenylene 2d), having one phenylthio moiety in each alkenyl backbone. Reaction of the diterminal alkynyl areneacetylide of the trans-platinum(II) complex with benzenethiol in chloroform, upon photoirradiation, readily affords the trans-platinum(II) alkenylarylacetylides in good to excellent yields with good regioselectivity. The absorption and photoluminescence spectra indicated that the emission was exhibited in the range 399–425 nm depending on the nature of the acetylide ligand bound to the central metal platinum.