Abstract
The electrochemical reduction of N -methylpyridinium ion (NMP + ) at concentrations <2 × 10 −4 M in aqueous solution in the pH range of 5–11 has been shown to he a one-electron process which gives rise to 1-methyl-1,4-dihydropyridinyl radicals. These pyridinyl radicals undergo rapid dimerization for which the bimolecular rate constant has been shown to be in excess of 1 × 10 7 M −1 s −1 . The formal potential for the reduction of NMP + in aqueous 1.0 M KCl is found to be −1.372 V vs. NHE. The formation of the pyridinyl radical as a transient intermediate in the electroreduction of NMP + has been established by spin trapping using α-phenyl- N-tert -butyl nitrone.
Published Version
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