Abstract
Thermodynamic stability of complexes of Ni II and Co II with (3,4-dihydroxyphenyl)alanine (DOPA) and L-alanine, L-phenylalanine, L -aspartic acid and L-glutamic acid were investigated. Thermodynamic formation constants of these complexes were determined at three different ionic strengths at 20 ± 1°C and 30 ± 1 °C in aqueous medium under equimolar condition by subjecting experimental data to the computation applying SCOGS computer program. Thermodynamic parameters for mixed coordinated systems were calculated by using van't Hoff isotherm, van't Hoff isochore and Gibb's Helmholtz equation. Species distribution is obtained for all ternary (biligand) systems. Complexation behaviour of ligands is discussed.
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