METAL-BETAINE INTERACTIONS .2. CRYSTAL-STRUCTURES OF CATENA-DICHLORO(BETAINE)CADMIUM(II) AND DIMERIC DIAQUABIS(BETAINE)TETRACHLORODICADMIUM(II)

Two cadmium(II) complexes of betaine (BET) have been prepared and characterized by X-ray crystallography. [Cd(BET) (mu-Cl)2] infinity (1), is a one-dimensional polymer in which each cadmium atom is coordinated by two pairs of bridging chlorine atoms [Cd-Cl = 2.631(2), 2.614(2) angstrom] and two oxygen atoms from different bridging carboxylate groups [Cd-O = 2.291(6), 2.329(6) angstrom] in the form of a compressed octahedron. [Cd(BET)(H2O)Cl (mu-Cl)]2 (2) is a dimer with each cadmium atom in a distorted octahedral coordination environment, being surrounded by a chelating bidentate carboxylate group [2.480(2), 2.332(3) angstrom], one aqua ligand [2.364(3) angstrom], two bridging chlorine atoms [2.659(1), 2.557(1) angstrom], and one terminal chlorine atom [2.480(1) angstrom.