Heteroleptic cobalt(II) and nickel(II) complexes with iminodiacetic and dicarboxylic acids in aqueous solution

Author： Kornev V.   Semenova M.   Merkulov D.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1070-3284

Source： Russian Journal of Coordination Chemistry, Vol.36, Iss.8, 2010-08, pp. : 591-596

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Abstract

Equilibria in binary and ternary systems containing cobalt(II) and nickel(II) salts, iminodiacetic acid, and dicarboxylates were studied by spectrophotometry at I = 0.1 (NaClO4) and T = 20 ± 2°C. The molar and proton compositions of the resulting complexes and the pH ranges of their existence were determined. The stability constants of the homo- and heteroleptic complexes were calculated. The pH-distribution of the detected complexes was obtained. The experimental data were analyzed using the mathematical models that predict the existence of a wide spectrum of complex species in solution and allow ignoring those species that are negligible for accurate reproduction of the observed pattern.

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