Synthesis, Crystal Structures and DNA-Binding of Cu(II), Zn(II) Coordination Polymer Constructed from 4-Hydroxyphenylacetic Acid

Two transition metal complexes [M(HPAA)(phen)(2)]HPAA center dot 7H(2)O(M=Zn, 1; Cu, 2; HPAA(-)=-4-hydroxyphenylacetic acid anion; phen=1,10-phenanthroline) were sythesized and characterized by elemental analysis, IR and TG-DTG. Their crystal structures were determined by single crystal X-ray diffraction method. The crystal structure anlysis reveals two complexes belong to isomorphism, and the asymmetric unit contains one metal ion, two 4-hydroxyphenylacetic acid anions and seven free water molecules, one of acid anions is not coordinated with the metal ion. The metal ion is six-coordinated and involved in a distorted octahedral coordination geometry. In addition, the interaction of complexes with DNA were also studied by ethidium bromide (EB) fluorescence spectroscopy. CCDC: 729804, 1; 729805, 2.