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 κ 3 S,C,S and κ 3 N,C,N coordination modes were obtained. Reaction of 1 with K 2 PtCl 4 afforded a pincer Pt(II) complex ( 3 ) with the κ 3 S,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 κ 3 N,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.