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Induced Electron Transfer Reactions in Pentaammine Cobalt (III) Complexes of Alpha – Hydroxy Acids By Quinolinium Dichromate in Acetic Acid (70%) Medium: A Kinetic Study

K Anandaratchagan*, B Md. Nawaz and K. Subramani

The oxidation of pentaamminecobalt (III) perchlorate complexes of alpha-hydroxy acids by quinolinium dichromate (QDC) has been studied in 70% acetic acid. The oxidation of free alpha-hydroxy acids were also carried out under the same conditions for comparative purpose. The reaction was followed by observing the decrease in the absorbance at 440 nm for the Cr (VI) present in the reagent in a UV – Visible spectrophotometer. Product and stoichiometric analysis were carried out for the oxidation of complexes and free ligands. A mechanism involving one electron transfer for the complex and two electron transfer for the ligand was proposed.