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 κ³S,C,S and κ³N,C,N coordination modes were obtained. Reaction of 1 with K₂PtCl₄ afforded a pincer Pt(II) complex (3) with the κ³S,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 κ³N,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.