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New Cu(II) complexes with polydentate chelating Schiff base ligands: Synthesis, structures, characterisations and biochemical activity studies

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Abstract

We have reported herein the synthesis of three new Cu(II) complexes of tri- and tetradentate Schiff base ligands containing N3 or N4 donor set along with terminal NNN− or SCN− ligands: [L1Cu(NCS)]ClO4 (1), [L2Cu(NCS)2] (2) and [L3Cu(NNN)]ClO4 (3) [L1 = NC5H4C(CH3)=N(CH2)3N=C(CH3)C5H4N, L2= Me2N–(CH2)3–N=C(CH3)C5H4N and L3 = NC5H4CH=N–(CH2)4–N=CHC5H4N]. The complexes have been systematically characterised by elemental, spectroscopic and electrochemical techniques. Antimicrobial activities of the Schiff base ligands and their metal complexes have been studied using the disc diffusion method on the strains of Candida tropicalis and Bacillus megaterium. Structures of all the complexes have been unequivocally established from single crystal X-ray diffraction analyses that show the monomeric units containing a five-coordinated copper center in highly distorted square pyramidal geometry with thiocyanate or azide anion coordinated as terminal ligand. The complexes 1 and 3 crystallise in monoclinic (P21/c) and 2 in triclinic (P-1) space group, respectively.

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Acknowledgements

Joy Chakraborty gratefully acknowledges University Grants Commission, New Delhi, Government of India for the extension of kind financial help. He also acknowledges Ms. Lipika Roy of Indian Institute of Technology, Bombay and Ms. Maitri Mapa of National Chemical Laboratory (CSIR), Pune for their valuable support.

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Authors and Affiliations

  1. Department of Chemistry, Jadavpur University, Kolkata, 700 032, West Bengal, India

    Brajagopal Samanta, Joy Chakraborty, C. R. Choudhury, S. K. Dey & Samiran Mitra

  2. Department of Chemistry, Chandidas Mahavidyalaya, Khujutipara, 731 215, Birbhum, West Bengal, India

    D. K. Dey

  3. School of Chemistry, Monash University, P.O. Box 23, 3800, Victoria, Australia

    S. R. Batten & P. Jensen

  4. Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA

    Glenn P. A. Yap

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  1. Brajagopal Samanta
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  2. Joy Chakraborty
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  3. C. R. Choudhury
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  9. Samiran Mitra
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Correspondence to Samiran Mitra.

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Samanta, B., Chakraborty, J., Choudhury, C.R. et al. New Cu(II) complexes with polydentate chelating Schiff base ligands: Synthesis, structures, characterisations and biochemical activity studies. Struct Chem 18, 33–41 (2007). https://doi.org/10.1007/s11224-006-9115-0

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  • DOI: https://doi.org/10.1007/s11224-006-9115-0

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