Synthesis, structure and properties of ternary copper(II) complexes of ONO donor Schiff base, imidazole, 2,2′-bipyridine and 1,10-phenanthroline
作者:R.N. Patel、Nripendra Singh、V.L.N. Gundla
DOI:10.1016/j.poly.2006.06.017
日期:2006.12
Reaction of copper(II) salt with salicylidene anthanilic acid (SAA), a tridentate ligand and imidazole (ImH), a monodentate ligand or bidentate polypyridyl ligands like 2,2'-bipyridine (bipy) or 1,10-phenanthroline(phen) in MeOH:MeCN (1:1 V/V) yields [Cu(SAA)(ImH)] (1), [Cu(SAA)(bipy)]CH3CN (2) and [Cu(SAA)(phen)] (3) in similar to 80% yield. These complexes were characterized by elemental analysis, magnetic susceptibility, X-band e.p.r., electronic spectroscopy and cyclic voltammetry. All the reported complexes show g(parallel to) > g(perpendicular to) > 2.0023 and G values falling within the range of 2-4 are consistent with a d(x2-y2) ground state in a square planar or square pyramidal geometry. Single crystal X-ray analysis of 1 has revealed the presence of a distorted square planar geometry (N2O2) and 2 has revealed the presence of distorted square pyramidal (4 + 1) geometry. In both structures the ONO Schiff base occupies the basal plane. Magnetic susceptibility measurements at room temperature were in the range 1.79 +/- 0.01 BM. Superoxide dismutase (SOD) activity of the present complexes were also measured. (c) 2006 Elsevier Ltd. All rights reserved.