Synthesis and Characterization of a Product of a Reaction Between Trans-dichlorido-bis-(ethylenediamine)cobalt(III) with L-cystine

Abstract

Substitution reaction of complex, trans-[CoCl2(en)2]Cl, with sulfur containing agent L-cystine, has been studied 1.0 × 10−1 mol dm−3 aqueous perchlorate medium at various temperatures (30°C to 50°C) and pH (4.45 to 3.30) using Uv-vis spectrophotometer. The products are characterized by physico-chemical and spectroscopic methods datasets at various pH and temperatures. From this method, cis-[CoCl(en)2(H2O)]2+, hydrolysis of trans-[CoCl2(en)2]+, has formed complex to L-cystine, acts as bidentate ligand, through one Co–S and Co–N bonds at low pH (3.30). At high pH (3.75 to 4.45), this complex has formed product through Co–N and Co–O bonds. The activation parameters Ea, ΔH# and ΔS# have been determined. The products, SNi, and reversible rate constants have been evaluated.