X-RAY STRUCTURE DETERMINATION OF CIS-DICHLORO(DIMETHYL SULFOXIDE)(ACETONITRILE)-PLATINUM(II) AND CIS-DIBROMO(DIMETHYL SULFOXIDE)(ACETONITRILE)PLATINUM(II) - CIS-INFLUENCE OF LIGANDS IN THE COMPLEXES CIS-[PT(ME2SO)(LIGAND)CL2]

The reaction of the complexes K[Pt(Me2SO)X3] (X Cl, Br) with MeCN in water results in the isolation of solid cis-[Pt(Me2SO)(MeCN)X2] complexes. The latter complexes were characterized by the elemental analysis, IR and 1H NMR spectra and their structure was determined by the X-ray analysis. The complexes cis-[Pt(Me2SO)(MeCN)X2] are isostructural. cis-[Pt(Me2SO)(MeCN)Cl2] crystallizes in the triclinic space group P1. The unit cell parameters are: a = 7.346(1), b = 8.865(1), c = 14.886(2) Å, α = 90.58(1), β = 96.10(1), γ = 87.44(2)°, V = 962.9(3) Å3, ρ{variant}calc = 2.65 g cm-3, Z = 4; bond lengths in two crystallographically independent molecules (Å): PtCl (trans to N) 2.278(2), 2.278(2); PtCl (trans to S) 2.310(3), 2.322(3), PtN 1.977(8), 1.956(8); PtS 2.216(2), 2.224(3). cis-[Pt(Me2SO)(MeCN)Br2] crystallizes in the triclinic space group P1. The unit cell parameters are: a = 7.569(1), b = 9.053(2), c = 15.014(3) Å, α = 90.33(1), β = 95.20(1), γ = 87.12(1)°, V = 1023.3(4) Å3, ρ{variant}calc = 3.08 g cm-3, Z = 4; bond lengths in two crystallographically independent molecules (Å) are: PtBr (trans to N) 2.397(2), 2.394(2), PtBr (trans to S) 2.429(2), 2.427(2), PtN 1.983(13), 1.986(14), PtS 2.228(4), 2.233(5). Comparison of the data with those known from the literature suggests a mutual ligands influence in the cis-[Pt(Me2SO)(ligand)X2] complexes. © 1990.