Bulletin of the Chemical Society of Ethiopia (Jun 2005)
<b>Studies on the interaction of transition metal ions with some biologically active ligands by paper ionophoretic method</b>
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 plus or minus 0.05 and 3.72 plus or minus 0.03, respectively, at ionic strength 0.1 M HClO4 in aqueous medium and a temperature of 35 ºC.
