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In this work we report the results of a speciation study on the ternary complexes present in the ternary Ni(II)- 1,10 phenanthroline (Phen)-amino acids and Ni(II)- 2,2-bipyridine (Bipy)-amino acids, with amino acids = aspartic acid (H 2 Asp), glutamic acid (H 2 Glu), histidine (H 2 His) and cysteine (H 2 Cys). The analysis involved the use of potentiometric data in 1 M NaCl aqueous solution at 25°C and a least-squares method (LETAGROP). The relative stability of the ternary complexes were compared with the corresponding binary complexes. The concentration distribution of various species formed in aqueous solution were evaluated as a function of pH. The binary complexes in the Ni(II) – Phe and Ni(II) – Bipy systems in 1 M NaCl aqueous solution at 25°C were also studied.

Ternary complex formation of the nickel(II), 2,2’-bipyridine, 1,10’-Phenanthroline and some aminoacids