Abstract

Abdul Moheman^1*, Showkat Ahmad Bhawani² and Khwaja Salahuddin Siddiqi³

DOI : http://dx.doi.org/10.13005/ojc/380632

The kinetics of ligand substitution reaction of Cu(methionine)2 complex by polyamines has been followed conductometrically above pH 9.0 at 25 oC. Millimolar solution of the Cu(NO3)2 and methionine in 1:2 molar ratio in water shows increase in conductance with time. When a polyamine (en, dien and trien) is added to the complex, the conductance increases at a rapid rate due to substitution of methionine by polyamine leading to the formation of [Cu(polyamine)2]. It was observed that the exchange of methionine by polyamine proceeds in a first order process. Since the rate of the reaction varies with the size of polyamines they can be placed in the following, en > dien > trien. In acidic pH range the absorption spectrum varies negligibly. However, the concentration of methionine does not have any influence on the absorption spectra.

Copper nitrate; Ligand exchange; Methionine; Polyamines

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