SYNTHESIS AND STRUCTURE OF PALLADIUM COMPLEX [Ph3PCH=CHPPh3]2+[PdBr3(DMSO)]-2∙DMSO

Abstract

The palladium complex [Ph₃PCH=CHPPh₃]²⁺[PdBr₃∙DMSO]^–₂∙DMSO (1) has been synthesized by the reaction of palladium dibromide with 1,2-vinylene-bistriphenylphosphonium dibromide in the presence of hydrobromic acid in water, followed by recrystallization from dimethylsulfoxide. According to the X-ray diffraction data, the phosphorus atoms in cations have a slightly distorted tetrahedral environment (CPC 107,8(3)°–111,7(3)°), the P–С bond lengths are 1.779(6)–1.816(5) Å. In the square planar anions, the SPdBr trans-angles are 176.89(5) and 178.11(6) Å, and the BrPdBr trans-angles are 177.59(4)° and 177.82(3)° Å. Dimethylsulfoxide ligands are coordinated to the Pd atoms by the sulfur atoms: the Pd–S bond lengths are 2.2634(17) and 2.2666(18) Å, the Pd–Br bond lengths lie in the range of 2.4200(18)–2.4486(9) Å. Structural organization of the crystal is caused by the interionic H∙∙∙Br (2.90–3.02 Å) and H∙∙∙O (2.30–2.56 Å) hydrogen bonds.