Trimesityl phosphoniumyl cation radical: Electrogeneration and evolution

Belabbes Merzougui, Yves Berchadsky, Paul Tordo, Gérard Gronchi

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16 Citations (Scopus)

Abstract

The electrochemical oxidation of tris (2,4,6-tri-methyl-phenyl) phosphine (TMP) in acetonitrile was investigated on a platinum electrode. A fast mono-electronic transfer (Ep = 0.71 V vs sce) gives rise to the corresponding long-lived phosphoniumyl cation radical. This electrochemically generated radical undergoes a slow reaction with residual water, generating the corresponding phosphine oxide (TMPO) and hydro phosphonium (TMPH+). The kinetics of the decay of the cation radical has been studied, and a reaction mechanism is proposed. When TMP is oxidized on a platinum electrode at potentials higher than 1.5 V vs sce, a fast surface reaction involving residual water takes place. This process was studied by voltammetry at a rotating ring-disk electrode; the same products, TMPO and TMPH+ were formed.

Original languageEnglish
Pages (from-to)2445-2453
Number of pages9
JournalElectrochimica Acta
Volume42
Issue number16
Publication statusPublished - 1997
Externally publishedYes

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Keywords

  • Cation radical
  • Residual water
  • Ring-disk electrode
  • Tri-aryl phosphane

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Merzougui, B., Berchadsky, Y., Tordo, P., & Gronchi, G. (1997). Trimesityl phosphoniumyl cation radical: Electrogeneration and evolution. Electrochimica Acta, 42(16), 2445-2453.