Synthesis, characterization and crystal structures of two discrete Cu(II) complexes with mixed-ligands: [Cu(mal)(L)(H2O)]center dot H2O and [Cu(Phmal)(L)(2)] (mal = malonate dianion, phmal = phenylmalonate dianion and L = 5,5 '-dimethyl-2,2 '-bipyrid

摘要

Two new Cu(II) complexes with mixed ligands, [Cu(mal)(L)(H2O)] center dot H2O (1) and [Cu(phmal)(L)](2) (2) (mal = malonate dianion, plunal phenylmalonate dianion, L = 5,5'-dimethyl-2,2'-bipyridine) have been synthesized and characterized by elemental analyses, IR, UV-vis and X-ray single crystal diffraction. In both complexes the Cu(II) ions take five-coordinated square pyramidal geometry. 1 has a mononuclear structure, and assembles into a 2D supramolecular network by hydrogen bonding. 2 is a dinuclear complex, and also forms 2D framework via pi-pi interactions. The structural differences of the two complexes may be attributed to the variation of the substituted group of malonate dianion. (c) 2004 Elsevier B.V. All rights reserved.