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Redox Reactions of Transient Species Formed During Pulse Radiolysis of 2-Pyridine Carboxaldehyde and 2-Pyridine Methanol in Aqueous Solutions

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Rate constants for the reactions of e-aq , H and OH radicals with 2-pyridine carboxaldehyde and 2-pyridine methanol have been determined by pulse radiolysis technique. Reactions of reducing radicals such as acetone ketyl radicals and CO2-* with these compounds were also evaluated at various pHs. The species produced by the reaction of reducing radicals with these solutes was a strong reductant itself. While pyridinyl were produced in the case of 2-pyridine methanol, one-electron reduction of 2-pyridine carboxaldehyde led to the formation of PyCHOH radical. The one-electron reduction potential ofPyCHOH radicals was estimated by establishing an equilibrium with MV+ radical cations to be -0.6V vs NHE. OH radical reaction with 2-pyridine carboxaldehyde gave an OH adduct, while in the case of 2-pyridine methanol, OH radicals reacted partly by H-abstraction from the -CH2OH group. S04-* radical reaction with 2-pyridine carboxaldehyde produced a species which was reducing in nature. The rate constants for the reaction of e-aq and OH radicals are compared with similar values obtained in the case of other 2-pyridine derivatives to see if there is any electron-inductive effect.

Affiliations: 1: Applied Chemistry Division, Bhabha Atomic Research Centre, Bombay -400085, India


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