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Journal of Coordination Chemistry
Year: 2009  |  Volume: 62  |  Issue: 18  |  Page No.: 3073 - 3084

N-functionalized, cyclam-based unsymmetrical dicompartmental binuclear copper(II) complexes containing 4- and 6-coordination sites: electrochemical, magnetic, catalytic, and antimicrobial studies

S. Sreedaran, K. Shanmuga Bharathi, A. Kalilur Rahiman, R. Prabu, R. Jegadeesh, N. Raaman and V. Narayanan    

Abstract: A series of unsymmetrical dicompartmental binuclear copper(II) complexes have been prepared by Schiff-base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane (L) with aliphatic and aromatic diamines, copper(II) perchlorate and triethylamine. The complexes were characterized by elemental and spectral analysis. Electronic spectra of the complexes show d-d transitions in the range 663-786 nm. Electrochemical studies of the complexes in DMF show two irreversible one electron reduction processes  E1pc = -0.62 to -0.77 V and  E2pc = -0.94 to -1.17 V. Cryomagnetic investigations of the binuclear complexes show -2J values in the range of 154 to 236 cm-1. The rate constants for hydrolysis of 4-nitrophenylphosphate are in the range of 2.27 x10-2 to 9.21 x10-2 min-1 and for catecholase activity in the range of 3.06 x10-2 to 8.35 x10-2 min-1. All the complexes were screened for antifungal and antibacterial activity.

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