Mixed-ligand complex formation equilibria of Cu II with biguanide in presence of glycine as the auxiliary ligand
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In this article, the authors studied the mixed ligand complex formation of CuII with biguanide (Bg) and glycine (HG) and indicated the formation of the complexes: Cu(Bg)-2+, Cu(Cg)-1, Cg-2H), Cu(G)-2H) and G-1.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.read more
Citations
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Coordination equilibria in the complex formation of guanylurea with CuII: Formation and stability of binary CuII-guanylurea and ternary CuII-guanylurea-glycinate complexes
TL;DR: Combined pHmetric and spectrophotometric investigations on the complex formation equilibria of CuII with guanylurea (H21NC(=O) 2NH) in aqueous solution indicates variety of binary and mixed-ligand complexes.
References
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Coordinating properties of the amide bond. Stability and structure of metal ion complexes of peptides and related ligands
Helmut Sigel,R. Bruce Martin +1 more
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A study of some problems in determining the stoicheiometric proton dissociation constants of complexes by potentiometric titrations using a glass electrode
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The calculation of formation curves of metal complexes from pH titration curves in mixed solvents
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Computer calculation of equilibrium constants of species present in mixtures of metal ions and complexing agents.
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