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Mixed-ligand complex formation equilibria of CuII with biguanide in presence of glycine as the auxiliary ligand

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Abstract

Equilibrium study on the mixed ligand complex formation of CuII with biguanide(Bg) and glycine (HG), indicated the formation of the complexes: Cu(Bg)2+, Cu(Bg) 2+2 , Cu(Bg-H)(Bg)+, Cu(Bg-H)2, Cu(Bg)(OH)+, Cu(Bg-H)(OH); Cu(G)+, Cu(G)(OH), Cu(G)2; Cu(G)(Bg)+, Cu(G)(Bg-H); (G)Cu(Bg)Cu(G)2+, (G)Cu(Bg-H)Cu(G)+, and (G)Cu(Bg-2H)Cu(G). From the deprotonation constants of coordinated biguanide (Bg) in the complexes Cu(Bg)(OH)+, Cu(Bg-H)(Bg)+ and Cu(G)(Bg)+, the Lewis basicities of the coordinated ligand species (Bg-H)-, OH- and glycinate (G-) were found to be of the order: (Bg-H)-≫ OH- > G-. Bridging (N1-N4, N2-N5) tetradentate mode of coordination by biguanide species Bg, (Bg-H)- and (Bg2H)2- was indicated from the occurrence of biguanide-bridged dinuclear mixed ligand complexes (G)Cu(Bg)Cu(G)2+, (G)Cu(Bg-H)Cu(G)+, (G)Cu(Bg-2H)Cu(G) in the complexation equilibria.

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  1. Department of Chemistry, University College of Science, University of Calcutta, 92, Acharya Prafulla Chandra Road, 700 009, Kolkata

    Tannistha Roy Barman & G. N. Mukherjee

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  1. Tannistha Roy Barman
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  2. G. N. Mukherjee
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Correspondence to G. N. Mukherjee.

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Roy Barman, T., Mukherjee, G.N. Mixed-ligand complex formation equilibria of CuII with biguanide in presence of glycine as the auxiliary ligand. J Chem Sci 118, 411–418 (2006). https://doi.org/10.1007/BF02711451

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  • DOI: https://doi.org/10.1007/BF02711451

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