Synthesis, characterization and superoxide dismutase studies of square pyramidal copper(II) complexes with bi and tridentate polyamine ligands

Abstract

422-427Ternary copper(II) complexes containing bi and tridentate polyamine ligands, viz. [Cu(dien)(en)](ClO₄)₂(1), [Cu(dien)(temed)](ClO₄)₂(2) and [Cu(pmdt)(temed)](ClO₄)₂(3) where dien = diethylenetriamine, en = ethylenediamine, temed = N,N,N',N'-tetramethylethylenediamine and pmdt = N,N,N',N',N"-pentamethyldiethylenetriamine have been synthesized and characterized by elemental analysis, magnetic susceptibility, X-band EPR spectroscopy and electronic spectroscopy. Single crystal X-ray of complex (1) reveals the presence of a distorted square pyramidal geometry in the complex. The complex (1) crystallizes in the monoclinic space group P21/n with unit cell parameters a = 8.4014(10) Å, b = 14.474(3) Å and c = 12.935 (2) Å. Complex 1 has a five coordinate (4+1) geometry with a CuN₅ core. Magnetic susceptibility and electron paramagnetic resonance (EPR) behaviour of these complexes show their paramagnetic nature (3d⁹ Cu²⁺, S = ½). Superoxide dismutase activity of these complexes has also been measured