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The mechanism of the electrochemical reduction of 5‐nitrouracil
Author(s) -
Yu Hu,
ZhiBin Hu,
ZhengHao Wang
Publication year - 1988
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19880060202
Subject(s) - chemistry , electrochemistry , cyclic voltammetry , electrolysis , ion , reaction rate constant , cathode , proton , inorganic chemistry , reduction (mathematics) , photochemistry , electrode , kinetics , organic chemistry , electrolyte , physics , quantum mechanics , geometry , mathematics
The electrochemical reduction of 5‐nitrouracil (5NU) has been investigated on Ag‐Hg cathode in DMSO by cyclic voltammetry and controlled potential electrolysis, in combination with UV and ESR spectroscopies. The results showed that 5NU proceeds in a four‐electron reduction and simultaneously participates in the reaction as a proton donor. At a more negative potential, the 5NU anion (5NU − ) thus formed is reduced further through a one‐electron process to a dianion whose ESR parameters have been determined as a N = 14.6 G, a H = 5.2 G and g = 2.005. The radical decay process might be conjectured through protonization by accepting protons from 5NU, of which the rate constant k 1 = 52 M −1 ·s −1 .