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<b>STUDIES ON THE INTERACTION OF TRANSITION METAL IONS WITH SOME BIOLOGICALLY ACTIVE LIGANDS BY PAPER IONOPHORETIC METHOD</b>


Brij Bhushan Tewari*

Abstract

The binary equilibria of Cu(II)-methionine, Co(II)-methionine, Cu(II)-nitrilo- triacetate, Co(II)-nitrilotriacetate and the ternary equilibria Cu(II)-nitrilotriacetate-methionine, Co(II)-nitrilotriacetate-methionine have been studied by using paper ionophoretic method (PIM). The proportion of ionic species of nitrilotriacetate and methionine were varied by changing pH of the background electrolyte. The logarithm stability constants values of the mixed complexes of Cu(II)-nitrilotriacetate-methionine and Co(II)-nitrilotriacetate-methionine were found to be 4.72 ± 0.05 and 3.72 ± 0.03, respectively, at ionic strength 0.1 M HClO4 in aqueous medium and a temperature of 35 ºC.



KEY WORDS: Ionophoretic technique, Overall mobility; Mixed complexes, Stability constants; Copper(II) complexes, Cobalt(II) complexes, Nitrilotriacetic acid, Methionine


Bull. Chem. Soc. Ethiop. 2005, 19(1), 117-123.

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eISSN: 1726-801X
print ISSN: 1011-3924