Asian Journal of Research in Chemistry

P. Rajkumar ¹, K. Subramani ²

Affiliations
1 Department of Chemistry, Priyadarshini Engineering College, Vaniyambadi-635751, TamilNadu, IN
2 PG and Research Department of Chemistry, Islamiah College, Vaniyambadi-635752, TamilNadu, IN

Abstract

The Oxidation of Pentaamminecobalt(III) complexes of α-Hydroxy acids and α-Amino acids by PMS has been studied in different Micellar medium. The Oxidation of free α-hydroxy acids and α-amino acids were also carried out under the same conditions for comparative purpose. On comparing these two substrates with PMS oxidation of α-hydroxy acids react faster than α-amino acids. In these reaction the rate of oxidation shows first order kinetics each in [Cobalt (III)] and [PMS].The reaction has followed by observing the decrease in the absorbance at 502 nm for Co(III) complex in a UV-visible spectrophotometer. Product and Stoichiometric analysis were carried out for the oxidation of complexes and free ligands in three different (Anionic, Cationic and Neutral) micellar medium with increasing micellar concentration an increase in the rate is observed. Among three different micelles Cationic micelle of Cetyltrimethylammonium bromide (CTAB) react faster than Anionic micelle of Sodium laurylsulphate(NaLS) and Neutral micelle of Triton. A Mechanism involving the one electron transfer for the complex and two electron transfer for the ligand was proposed.

Keywords

Pentaamminecobalt(III) complexes, Triton X-100, Cetyltrimethylammonium bromide (CTAB), Oxidation reaction Mechanism, Permonosulphuric acid(PMS), Sodium laurylsulphate (NaLS).

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T. Palanisamy ¹, P. Rajkumar ², K. Subramani ³

Affiliations
1 PG Department of Chemistry, H.H. The Rajah’s College (Affiliated to Bharathidasan University, Tiruchirapalli), IN
2 Department of Chemistry, Priyadarshini Engineering College (Affiliated to Anna University, Chennai), IN
3 PG & Research Department of Chemistry, Islamiah College (Affiliated to Thiruvalluvar University, Vellore), IN

Abstract

The oxidation of pentaamminecobalt(III) complexes of α-hydroxy acids and by Manganese(III) Perchlorate (Mn^(III)(ClO₄)₃) in micellar medium yielding nearly 100% of carbonyl compounds and 100% Co(II) are ultimate products. In this reaction the rate of oxidation shows first order kinetics each in [Co(III)] and [Mn^(III)(ClO₄)₃]. The unbound α-hydroxy acids yield about 100% of carbonyl compounds in presence of micelles. The rate of oxidation of Co(III) complexes of both bound and unbound α-hydroxy acids are enhanced more in the presence of cationic micelle Cetyltrimethylammonium bromide (CTAB), when compared to the anionic micelle of Sodium laurylsulphate (NaLS). The 1 mole of cobalt(III) complexes of α-hydroxy acids reacts with nearly 0.5 mole of Manganese(III) Perchlorate, similarly 1 mole of α-hydroxy acids reacts with nearly 1 mole of Manganese(III) Perchlorate. The reaction goes by free radical mechanism was proved by acrylonitrile polymerization. The appropriate methodology has been inducted.

Keywords

Manganese(III) Perchlorate (Mn^(III)(ClO₄)₃), α-Hydroxy Acids, Stoichiometry, Sodium Laurylsulphate (NaLS), Cetyltrimethylammonium Bromide (CTAB).

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