STEREOELECTRONIC PROPERTIES OF THE SULFINYL-SUBSTITUTED PHOSPHINE-LIGANDS - SYNTHESIS AND X-RAY STRUCTURE OF THE STABLE COMPLEX [PDCL2(PH(2)PCH(2)S(O)ME)(MEOH)]

The square-planar complex trans-[PdCl2{Ph(2)PCH(2)S(O)Me}{MeOH}] has b een prepared. The compound crystallizes as orange-red prisms in the mo noclinic space group P2(1)/n, with a = 9.446(2), b = 14.858(3), c = 13 .578(3) Angstrom, beta = 105.08(2)degrees and Z = 4. The structure was determined by direct methods and refined to R = 0.027 and R(w) = 0.04 1. All atoms including hydrogens were located directly from Fourier di fference maps. The coordination geometry around palladium is square-pl anar. The metal is coordinated to the two chlorines, the oxygen of met hanol and the phosphorus of the sulfinyl-substituted ligand. In soluti on, a similar structure is assigned to the complex by NMR studies. In contrast to the previously documented Ph(2)PCH(2)CH(2)S(O)Me analogue, the sulfoxide function in the Ph(2)PCH(2)S(O)Me ligand is not involve d in any coordination bondings with palladium, both in the solid state and in solution.