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Kinetic and Spectral Properties of the Intermediates Formed in the Pulse Radiolysis of 2-Mercaptobenzimidazole

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The reactions of primary species of water radiolysis such as e-aq, H' and *OH, and some specific one electron reductants and oxidants with 2-mercaptobenzimidazole have been studied at various pHs. *OH radical reaction with MBZ at pH 7 gave a transient species having absorption maxima (λmax) at 330 and 590 nm. The transient species (pKa = 3.6) was found to be neutral at this pH and was a mild oxidant. The initial transient species formed by the reaction of MBZ with e-aq at pH 7 and with H atom at pH 0 were found to react with the parent molecule to form another transient species which has an absorption spectrum similar to that obtained by 'OH radical reaction with λmax at 590 nm. However the reaction is not quantitative. The kinetic, spectral, acid-base and redox properties of the transient species are reported.

Affiliations: 1: Applied Chemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay-400 085, India


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