Abstract
Values for the thermodynamic functions (enthalpy and entropy changes) were determined for the formation of mixed complexes of transition metals with uramildiacetic acid (UDA) and nitrilotriacetic acid (NTA) as “primary” ligand and glycine as secondary ligand, using the temperature coefficient method. The mixed complexes are stabilized by the enthalpy changes in the reaction of MX with L; entropy changes are unfavourable to complex formation. There results were interpreted in terms of the covalent and electrostatic contributions of the metal-nitrogen and metal-carboxylate interactions as well as of structural modifications in the complexes to the overall enthalpy changes. The results obtained were complemented by a spectrophotometric study of the complexes formed by cobalt, copper and nickel.
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