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Abstract

Complexation Behaviour and Speciation Equilibria of Multimetal Multiligand Complexes of Bioactive Transition Metals Involving α – ε – diaminocaproate and 5-methyl-2,4-dioxopyrimidine

Author(s): V.P. Shukla, Surabhi Sinha, and Vijay Krishna

Chelation tendency of α-ε-diaminocaproate (lysine=A) to form heterobinuclear complexes with some bioactive transition metal ions (viz. Co II , Ni II , Cu II , Zn II ) in the presence of 5-methyl-2,4-dioxopyrimidine (thymine = B) have been examined potentiometrically in aqueous medium. Speciation constants of complexes at 37± 1º and at constant ionic strength 0.1 M NaNO3 have estimated using SCOGS computer program and complex formation equilibria were interpreted. Species distribution curves are finally sketched by running the computer program ORIGIN 4.0. The relevant stability constant of binary, ternary( mixed ligand ), quaternary (multimetal, multiligand) (MA, MB, MAB, M1M2AB ) complexes follow Irving William order. The results are discussed to obtain the order of formation constants of the above mentioned complexes and probable solution structures of metal complexes with said ligand have been discussed.


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