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Kinetics of oxidation of indole-3-acetic acid (IAA) by peroxomonosulphate (PMS) in aqueous acetonitrile medium has been investigated. The reaction follows a total second order, first order each with respect to [IAA] and [PMS]. The rate of the reaction was not affected by added [H + ]. Variation of ionic strength (µ) had no influence on the rate. Increase of percentage of acetonitrile decreased the rate. Absence of any polymerization indicated a nonradical pathway. Activation and thermodynamic parameters have been computed. A suitable kinetic scheme based on these observations is proposed. The reactivity of PMS towards IAA was found to be higher than that with peroxodisulphate.

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The kinetics of oxidation of indole-3-acetic acid (IAA) by peroxodisulfate (PDS) has been carried out in aqueous acetic acid medium. First-order dependence of rate each with respect to [IAA] and [PDS] was observed. The reaction rate was unaffected by added [H + ]. Increase of percentage of acetic acid decreased the rate. Variation of ionic strength (µ) had negligible influence on the rate. A suitable kinetic scheme based on these observations involving a nonradical mechanism is proposed. The reactivity of peroxodisulfate toward indole-3-acetic acid was found to be lower than that with peroxomonosulfate. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [355][356][357][358][359][360] 2005

The infrared spectra of 2-Thiouracil (Thu) have been recorded in the region 4000-400 cm -1 . The assignments of fundamental frequencies have been proposed on the basis of assignments in related molecules. Correlation of vibrational assignments with those of related molecules have been pointed out. The metal ion interactions of Thu with Cd (II), Hg (II), Cu (II), and Zn (II) bromides have been investigated by infrared spectroscopy. The results are consistent with the bonding of ligands through sulphur in all the complexes. The vibrational frequencies of metal complexes of 2-Thiouracil are correlated with the spectral data of other structurally related pyrimidine thione complexes.