Abstract
Solution studies on ternary complexes of Cu II with diamines (A) viz. ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, o-, m- or p-phenylenediamine and salicylic acid (H 2 L) in the ratio of 1: 1: 1 have been investigated by pH metric technique at μ = 0.2 M (NaClO 4 ) and at temperature 30 ± 0.1 °C in aqueous media. The formation constant values for ternary system Cu II -diamine-salicylic acid has been calculated and probable species like H 2 L, HL, CuALH, CuAL 2 etc. are pruned with FORTRAN IV computer program. These values are discussed in terms of basicity of primary and secondary ligand, size of chelate ring, A log K T values and different statistical factors such as metal-ligand interaction, structure of ligands and intermolecular ligand-ligand interactions. Structure of complexes is suggested on the basis of molecular modeling.
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