MONONUCLEAR CADMIUM(II) HALIDE-COMPLEXES OF TRIPHENYLPHOSPHONIOBUTYRATE, [CDCL(2)L(2)CENTER-DOT-H2O] AND [CDX(2)L(2)] (X=BR, I) (L=PH(3)P(-))()(CH2)3(C)O(2)()

Three mononuclear cadmium(II) complexes containing the tertiary phosph ine betaine ligand triphenylphosphoniobutyrate, Ph(3)P(+)(CH2)(3)CO2-, (L) have been synthesized and characterized by single crystal X-ray a nalysis. In CdCl(2)L(2) . H2O (1) the cadmium(II) atom is coordinated by pairs of unidentate betaine ligands and chloro ligands in a tetrahe dral environment, and the primarily discrete species are joined by don or hydrogen bonds from the solvated water molecules to the pendant oxy gen atom of the betaine ligands to form a dimer. In CdBr(2)L(2) (2) th e cadmium(II) atom is coordinated in a similar manner, but one Cd-Br d istance is so long that it may be considered as a weak interaction. In CdI(2)L(2) (3) the betaine ligands act differently in the bidentate c helate and unidentate modes. Copyright (C) 1996 Elsevier Science Ltd