%0 Journal Article
%T Ce(IV) ¨C Induced electron transfer in Pentaammine Cobalt (III) complexes of   -amino acids in micellar medium
%A A.Thaminum Ansari1 *
%A K.Subramani2
%J International Journal of ChemTech Research
%D 2009
%I Sphinx Knowledge House
%X :A micellar catalysed oxidation of pentaamminecobalt(III) complexes of   - amino acids by Ce(IV) in acidic medium yielding nearly 40% of Co(II), 40% of HCHO and about 60% of glyoxalatocobalt(III) complex are ultimate products. The unbound amino acids yield about 40% of HCHO and 60% of glyoxalic acid in presence of micelles. The effect of variation of sulphuric acid concentration is not substantial. The decrease in UV-Visible absorbance at ¦Ë = 502 nm for Co(III) complex corresponds to nearly 40% of the initial absorbance. In spite of the stoichiometry of Ce(IV) to unbound ligand is 2.0:1.0, the ratio of Ce(IV) to cobalt(III) complex is 1.5:1.0 accounting for about 40% reduction at the cobalt(III) centre. The kinetic and stoichiometric results have been accounted. A suitable mechanism consistent with the experimental findings has been proposed by involving a radical cation intermediate.Keywords:  :A micellar catalysed oxidation of pentaamminecobalt(III) complexes of   - amino acids by Ce(IV) in acidic medium yielding nearly 40% of Co(II), 40% of HCHO and about 60% of glyoxalatocobalt(III) complex are ultimate products. The unbound amino acids yield about 40% of HCHO and 60% of glyoxalic acid in presence of micelles. The effect of variation of sulphuric acid concentration is not substantial. The decrease in UV-Visible absorbance at ¦Ë = 502 nm for Co(III) complex corresponds to nearly 40% of the initial absorbance. In spite of the stoichiometry of Ce(IV) to unbound ligand is 2.0:1.0, the ratio of Ce(IV) to cobalt(III) complex is 1.5:1.0 accounting for about 40% reduction at the cobalt(III) centre. The kinetic and stoichiometric results have been accounted. A suitable mechanism consistent with the experimental findings has been proposed by involving a radical cation intermediate.
%K Pentaamminecobalt(III) complexes
%K Induced electron transfer reaction
%K Micelles
%K Triol
%K Complex formation.
%U http://sphinxsai.com/pdf/jct_Ap_Ju_09/CT=5%20thaminum%20ansari%20%20(139-148).pdf