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In this work, we present the results from a study of the speciation of the ternary systems formed by copper(II),2-(benzo(d)oxazol-2-yl)nicotinic acid (Oxa, HL) as the main ligand, and the amino acids Serine (Ser, A – ), Threonine (Thr, A – ), Methionine (Met, A – ), Phenylalanine (Phe, A – ), Aspartate (Asp, A 2– ), Glutamate (Glu, A 2– ), and Histidine (His, A – ) as secondary ones. The potentiometric data was analyzed using the computational program LETAGROP for systems in aqueous solution at 25 °C and 1.0 M KNO 3  as the ionic medium. The ternary complexes [Cu(L)(HA)] + , [Cu(L)(A)], [Cu(L) 2 (A)] – , [Cu(L)(A) 2 ] – , [Cu(L)(A)(OH)] –  and [Cu(L)(A)(OH) 2 ] 2–  were detected. The relative stability of the ternary complexes was compared to the binary ones considering the values of Δlog K  and log χ  (defined in text of results and analysis). Subsequently using the formation constants, the species distribution diagrams were generated and are briefly discussed. The UV–visible spectra of the ternary complexes show a maximum at 610–654 nm indicating that the Cu 2+  is penta-coordinated.

Stability constants of the ternary copper(II) complexes with 2-(benzo(d)oxazol-2-yl)nicotinic acid and some amino acids