Coordination properties of N,O-carboxymethyl chitosan (NOCC). Synthesis and equilibrium studies of some metal ion complexes. Ternary complexes involving Cu(II) with (NOCC) and some biorelevant ligand |
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Authors: | Azza A Shoukry Wafaa M Hosny |
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Institution: | 1.Department of Chemistry, Faculty of Science,Cairo University,Giza,Egypt |
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Abstract: | In the present study, the acid-base equilibria of N,O-carboxymethy chitosan abbreviated as (NOCC), is investigated. The complex
formation equilibria with the metal ions Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) are investigated potentiometrically. The stability constant values of the binary and ternary complexes formed in solution
were determined and the binding centers of the ligands were assigned. The relationships between the properties of the studied
central metal ions as ionic radius, electronegativity, atomic number, and ionization potential, and the stability constants
of the formed complexes were investigated in an effort to give information about the nature of chemical bonding in complexes
and make possible the calculation of unknown stability constants. Cu(II), Ni(II), and U(VI) complexes with NOCC are isolated as solid complexes and characterized by conventional chemical and physical methods. The
structures of the isolated solid complexes are proposed on the basis of the spectral and magnetic studies. The ternary copper(II)
complexes involving NOCC and various biologically relevant ligands containing different functional groups, as amino acids
and DNA constituents are investigated. The stability constants of the complexes are determined and the concentration distribution
diagrams of the complexes are evaluated. |
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