Croatica Chemica Acta
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چکیده
A new method, involving the use of paper electrophoresis is described for the study of the equilibria in mixed ligand complex systems in solution. This technique is based on the movement ef a spot of metal ion under an electric field with the complexants added in the background electrolyte at p'H = 8.5. Concentration of the primary Iigand (NTA) was kept constant while that of the secondary Iigand (5-amino pentanoic acid) was varied. The plots of-log [5-amino pentanoic acid] against mobility were used to obtain information on the forma tion of mixed complex and to calculate its stability constants. The binary equilibria M(II)-(5-amino pentanoic acid) and M(II)-NTA have also been studied since this is a prerequisite for the investigation of mixed complexes. The stability constants of the cornplexes, metal-nitrilotriacetate-5-amino pentanoate have been found to be 5.85, 5.50, 5.22, 3.96 and 3.90 (log K values) for Cu(II), UOz(II), Ni(II), Co(II) and Zn(II) complexes, respectively, at fL = 0.1 mol/L and a temperature of 35 -c.
منابع مشابه
A Theoretical Information Approach to Ring and Total Aromaticity' in Ground and Excited States
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تاریخ انتشار 2017