• M. Murali
• V. Sathya

The green coloured mononuclear copper(II) complex [Cu(L)(pybzim)](ClO4) (1), where HL is tridentate Schiff base (NNO donor) ligand obtained from the condensation of 2-hydroxy-1-naphthaldehyde and N,N-diethylethylenediamine and pybzim is 2-(2-pyridyl)benzimidazole, has been synthesized and characterized. The copper(II) complex exhibits a broad band in the visible region (max, 647 nm) and axial EPR spectra in DMF (77 K) with g|| and A|| values of 2.236 and 185 × 10-4 cm-1 respectively. The complex involves meridional coordination of the tridentate Schiff base ligand and possesses a CuN4O chromophore with distorted square pyramidal geometry. It displays intermolecular noncovalent interaction as revealed by frozen solution EPR spectra in weakly coordinating solvents like MeOH and MeCN. The complex undergoes reversible Cu(II)/Cu(I) redox behavior (E1/2, +0.014 V; Ep, 85 mV) in methanol solution. The electron-releasing -NEt2 group as in the complex confers higher energy visible band and positive E1/2 for the Cu(II)/Cu(I) couple and enhances the stabilization of Cu(II). The complex effectively catalyzes the oxidation of ascorbic acid to dehydroascorbic acid, benzylamine to benzaldehyde and 3,5-di-tert-butylcatechol to 3,5-di-tert-butyl-o-quinone, thus mimicking the function of type-2 and type-3 copper oxidases.

Copper(II) complex, electronic spectra, EPR, redox properties, catalytic activity

"Synthesis, Spectral, Redox and Catalytic properties of Mononuclear Copper(II) Complex", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.395-403, November-2018, Available :http://www.jetir.org/papers/JETIR1811B60.pdf

"Synthesis, Spectral, Redox and Catalytic properties of Mononuclear Copper(II) Complex", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp395-403, November-2018, Available at : http://www.jetir.org/papers/JETIR1811B60.pdf