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Metal Chelates of Hydrazone Ligand Chelating Tendencies of 2-Carboxyphenylhydrazoacetoacetanilide (2-Cphaaa) Ligand

Author Affiliations

  • 1Chemistry Department, Faculty of Education Ain Shams University Roxy, Cairo, EGYPT

Res.J.chem.sci., Volume 1, Issue (7), Pages 1-14, October,18 (2011)

Abstract

The chelating properties, of hydrazone ligand 2-carboxyphenylhydrarzoacetoacetanilide (2-CPHAAA) (H2L) have been studied. A series of binary complexes, of HL with the metal ions Cd(II), Cu(II), Co(II), UO (VI) and Th(IV) were prepared. The binary Cu (II) complexes of 2-CPHAAA was reacted with the ligands 1,10 –phenanthroline (1,10- phen) and 2-amino-4-methyl-pyridine (2 AMP) to form mixed ligand complexes. The structures of all complexes, were elucidated by elemental analyses, conductance, IR ,electronic absorption spectra , magnetic moment, 1HNMR and TG-DSC measurements. The metal –ligand stability constants of the Cu(II), Ni(II) , Co(II) , Zn (II) , Mn(II) , Cd(II) UO2(VI), Th(IV) , Sm (III) and Er(III) chelates of 2-CPHAAA were determined in 75%(v/v) dioxane water medium at 10,20,30 and 40 C and µ = 0.10 M KNO. The thermodynamic parameters for the proton – ligand and metal ligand stability constants were obtained by the temperature coefficient method. The thermodynamic functions G and H of the complexes were analyzed in terms of electrostatic (el) and non electrostatic (non) components. The values of H non show a linear variation with the hardness andsoftness (En) of the metal ion. The ternary complexes of 2–CPHAAA complexes of the Th (IV) and UO(VI) with 2AMP or 1,10-phen ligands were studied in 75% (v/v) dioxane water solvents.

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