| Abstract: | Complexation in the Co(II)?Ni(II)?aminoethanoic acid (HGly)?EDTA (H4Edta) system was studied at different molar ratios of components by absorption spectrophotometry. The mathematical modeling of A = f(pH) curves was used to establish that bi-, tri-, and tetranuclear heteroligand complexes like (CoGly)Edta(NiGly)]2?, (CoGly2)Edta(NiGly2)]4?, (CoGly2)Edta(NiGly2)2]4?, (CoGly2)2Edta(NiGly2)]4?, and (CoGly2)2Edta(NiGly2)2]4?, whose accumulation fraction attained 80?100% at optimal pH values, were formed depending on the ratio of reagents and the acidity of a medium. The formation equilibrium and total stability constants of these complexes were calculated, and a hypothesis about their structure was made. |
