Trimesityl phosphoniumyl cation radical

Electrogeneration and evolution

Belabbes Merzougui, Yves Berchadsky, Paul Tordo, Gérard Gronchi

Research output: Contribution to journalArticle

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

Fingerprint

phosphine
Thymidine Monophosphate
Cations
Positive ions
Platinum
Electrodes
Water
Electrochemical oxidation
Surface reactions
Voltammetry
Acetonitrile
Oxides
Kinetics
3,3,5,5-tetramethyl-1-pyrroline N-oxide

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.

Trimesityl phosphoniumyl cation radical : Electrogeneration and evolution. / Merzougui, Belabbes; Berchadsky, Yves; Tordo, Paul; Gronchi, Gérard.

In: Electrochimica Acta, Vol. 42, No. 16, 1997, p. 2445-2453.

Research output: Contribution to journalArticle

Merzougui, B, Berchadsky, Y, Tordo, P & Gronchi, G 1997, 'Trimesityl phosphoniumyl cation radical: Electrogeneration and evolution', Electrochimica Acta, vol. 42, no. 16, pp. 2445-2453.
Merzougui, Belabbes ; Berchadsky, Yves ; Tordo, Paul ; Gronchi, Gérard. / Trimesityl phosphoniumyl cation radical : Electrogeneration and evolution. In: Electrochimica Acta. 1997 ; Vol. 42, No. 16. pp. 2445-2453.
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