• P N Moorthy

      Articles written in Journal of Chemical Sciences

    • Redox reactions of 2-hydroxy pyridine: A pulse radiolysis study

      D B Naik P N Moorthy

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      Rate constants for reactions of 2-pyridinol with one electron reductants, such aseaq and H atoms and one-electron oxidants, viz. OH, N3, Br2, C12 and O have been determined at different pH values using the pulse radiolysis technique. From the corrected absorption spectra of the product transient species, the extinction coefficients of these species at their respective absorption maxima have been determined. The kinetics of decay of these transients have been investigated. ThepKa values of transients formed byeaq and OH radical reactions have been estimated to be 7.6 and 3.5 respectively. Rate constants for electron transfer from semireduced 2-pyridinol to different electron acceptors have been determined.

    • Reactions of sulphacetamide with pulse radiolytically generated reducing radicals

      S Sabharwal K Kishore P N Moorthy

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      Pulse radiolysis technique has been used to characterise the transients formed by the reaction of sulphacetamide with eaq- and subsequently study the electron transfer reactions from the transient to various electron acceptors such as thionine, safranine-T and methyl viologen. The results indicate that the semi-reduced sulphacetamide species are highly reducing in nature as they transfer electrons to various dyes with near diffusion controlled rates (k > 109dm3mol−1s−1) in alkaline and acidic solutions. The influence of oxygen on the decay behaviour of semi-reduced species has been investigated and the results show that O2 reaction with SA is very fast (k = 1.5 × l09dm3mol−1s−1) and leads to the formation of a permanent-coloured product. Reactions of H.atoms resulted in the formation of two transient species whose spectral, kinetic and acid-base characteristics have also been investigated.

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