☆ 4.5 Article

Co(III) and Ni(II) complexes of an anthracene appended aroyl hydrazone: Synthesis, crystal structures, DNA binding and catecholase activity

POLYHEDRON (2016)

Journal

POLYHEDRON

Volume 117, Issue -, Pages 327-337

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

DOI: 10.1016/j.poly.2016.05.052

Keywords

Co(III) complex; Crystal structure; Voltammetry; DNA binding; Catecholase activity

Categories

Chemistry, Inorganic & Nuclear Crystallography

Funding

Council of Scientific and Industrial Research (CSIR), New Delhi
All India Council for Technical Education (AICTE) [CH1106A]
Engineering and Physical Sciences Research Council [EP/K038869/1] Funding Source: researchfish
EPSRC [EP/K038869/1] Funding Source: UKRI

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Abstract

The Co(III) and Ni(II) complexes [Co(L-2)(2)(bpy)]Cl (1) and [Ni(L-2)(2)(phen)] (2) (where L-2 is a monoanionic bidentate hydrazone ligand and bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline) have been synthesized and characterized by infra-red, UV-Vis, ESI-MS spectroscopies and elemental analyses. Complexes 1 and 2 were structurally characterized by single crystal X-ray diffraction. Structural analysis reveals a distorted octahedral coordination environment around the metal center with an MN4O2 chromophore [M = Co(III) and NOD], with the hydrazone ligand acting as a monoanionic bidentate N, O-donor. Binding of complexes 1 and 2 with calf thymus DNA (CT-DNA) was investigated by UV-Vis absorption, fluorescence spectroscopy and viscosity measurements. Complex 1 shows excellent catecholase mimicking activity with 3,5-di-tert-butylcatechol (3,5-DTBCH2) as the substrate. Kinetic measurements suggest the rate of catechol oxidation follows saturation kinetics with respect to the substrate and the k(cat) value was found to be quite high, with a value of 1.00 x 10(5) h(-1). (C) 2016 Elsevier Ltd. All rights reserved.

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