Pressure effects on cation migration in 2,5-Di-tert-butyl-1,4-benzoquinone radical anion

Masamichi Kasahara, Yoshimi Sueishi, Shunzo Yamamoto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Pressure effects on the two-site jumping of sodium and potassium cations in a 2,5-di-tert-butyl-1,4-benzoquinone ion pair have been studied using a high-pressure EPR technique. The rate constants of the intramolecular and intermolecular migrations for Na+ and K+ were determined from an EPR spectral simulation. The migration rates were found to be accelerated by increasing the external pressure. Using the pressure dependence of the migration rates, we estimated the activation volumes of the intramolecular (ΔV1) and intermolecular (ΔV2) processes for the Na+ and K+ migrations: ΔV1 = -5.3 cm3 mol-1 and ΔV2 = -29 cm3 mol-1 for Na+, and ΔV1 = -8.3 cm3 mol-1 and ΔV2 = -0.85 cm3 mol-1 for K+. Based on the results, the mechanisms for the two-site jumping of Na+ and K+ are discussed in terms of volume.

Original languageEnglish
Pages (from-to)397-401
Number of pages5
JournalInternational Journal of Chemical Kinetics
Volume33
Issue number7
DOIs
Publication statusPublished - Jul 1 2001

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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