Preparation and characterization of luminescent SCS and NCN pincer platinum complexes derived from 3,5-bis(anilinothiocarbonyl)toluene

Starting from 5-methyl-1,3-bis(anilinothiocarbonyl)benzene (1), two types of luminescent pincer platinum complexes with kappa S-3, C, S and kappa N-3, C, N coordination modes were obtained. Reaction of 1 with K2PtCl4 afforded a pincer Pt(II) complex (3) with the kappa S-3, C, S coordination mode, whereas oxidative cyclization of 1 yielded 5-methyl-1,3-bis(benzothiazol-2-yl)benzene (2), which provided a pincer Pt(II) complex (4) with the kappa N-3, C, N coordination mode. Molecular structures and photochemical properties of the complexes have been examined. The decay lifetimes of the emission from the complexes were in the range 10(-5)- 10(-6) s, which were indicative of phosphorescent emission.