سید مجید هاشمی

A series of binuclear organoplatinum(II) complexes of general formula cis,cis-[R2Pt(l-SMe2)(l-dppm)Pt(o-MeC6H4)2], 3a–3d, in which R = Ph, p-MeC6H4, m-MeC6H4 or p-MeOC6H4, were prepared by the reaction of monomeric precursors [Pt(o- MeC6H4)2(dppm)] and cis-[PtR2(SMe2)2]. The binuclear dialkyl analogs, in which R = Me (3e) or R2 = {(CH2)4} (3f), were prepared by the reaction of cis-[Pt(o-MeC6H4)2 (SMe2)2] and [PtR2 (dppm)]. The complexes were fully characterized by multinuclear (1H, 13C, 31P, 195Pt) NMR spectroscopy each as a mixture of syn and anti isomers (depending on the relative orientations of Me substituents on o-tolyl ligands) and each isomer was shown to have a rigid structure. Other binuclear analogs cis; cis-½R2Pt?l-SMe2? ?l-dppm?PtR0 2
, 3g–3j, in which R is a less steric demanding aryl groups m-MeC6H4 or p-MeOC6H4, and R0 =Me or R0 2 ¼ f?CH2?4g, were prepared by the reaction of cis-[PtR2(SMe2)2] and ½PtR0 2?dppm?
, and shown to have fluxional structures.