Heteropolymetallic complexes containing ReO4−: Catalytic oxidation of sulfide

Heteropolymetallic complexes [(salen)Ti(ReO4)2] (1) and [{(salen)Ti(ReO4)}2(μ-O)] (2) are easily obtained in high yields via reaction of [(salen)TiCl2] and [{(salen)TiCl2}2(μ-O)] with (Me3SiO)ReO3, respectively (where, salen = (S,S)-N,N′-bis(3,5-di-tert-butylsalicylidene)cyclohexane-1,2-diamine dianion). The structure of complex 2 was established by single-crystal X-ray diffraction. The tetrahedral geometry of the ReO4− anion links the dititanium unit of {(salen)Ti}2(μ-O) in the axial positions. The Re–O–Ti bridge angles range from 146.1(2) to 162.6(2) with a Re⋯Ti separation of 3.780 Å. Complexes 1 and 2 are capable of catalytic oxidation of sulfides with tBuOOH.