New methods for synthesis of platinum(II) dimethyl sulfide complexes

Abstract

Different methods for the synthesis of anionic dimethyl sulfide platinum complexes of the type Q[PtCl 3(Me 2S)] (Q = triphenylbenzylphosphonium, Ph 3PBzl, or tetrabutylammonium, Bu 4N) and [Pt(μ-Cl)Cl(Me 2S)] 2 are reported. The compounds Q[PtCl 3(Me 2S)] were prepared by interaction of [PtCl 4] 2− with an excess of Me 2S in non-aqueous media, reduction of [PtCl 5(Me 2S)] − with hydrazine sulfate, bridge-splitting reactions of (Ph 3PBzl) 2[Pt 2(μ-Cl) 2Cl 4] and [Pt(μ-Cl)Cl(Me 2S)] 2 with two equivalents of Me 2S and (Ph 3PBzl)Cl, respectively, and substitution of dimethyl sulfide in trans-[PtCl 2(Me 2S) 2]. The [Pt(μ-Cl)Cl(Me 2S)] 2 dimer was prepared via reaction of cis-[PtCl 2(Me 2S) 2] with two equivalents of silver nitrate followed by separation of AgCl(s) and addition of one equivalent of K 2[PtCl 4]. The structure of (Ph 3PBzl)[PtCl 3(Me 2S)] was determined by X-ray single crystal analysis. The compound crystallizes in the space group P2 1/ n with a = 9.746(3), b = 19.511(4), c = 14.966(4) Å, β = 100.43(2)°, V = 2799.0(9) Å 3 and Z = 4.