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Titolo:
Pressure effects on cation migration in 2,5-di-tert-butyl-1,4-benzoquinoneradical anion
Autore:
Kasahara, M; Sueishi, Y; Yamamoto, S;
Indirizzi:
Okayama Univ, Fac Sci, Dept Chem, Okayama 7008530, Japan Okayama Univ Okayama Japan 7008530 ci, Dept Chem, Okayama 7008530, Japan
Titolo Testata:
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
fascicolo: 7, volume: 33, anno: 2001,
pagine: 397 - 401
SICI:
0538-8066(200107)33:7<397:PEOCMI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLVENT; EXCHANGE; ESR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Sueishi, Y Okayama Univ, Fac Sci, Dept Chem, 3-1-1 Tsushima Naka, Okayama 7008530, Japan Okayama Univ 3-1-1 Tsushima Naka Okayama Japan 7008530 , Japan
Citazione:
M. Kasahara et al., "Pressure effects on cation migration in 2,5-di-tert-butyl-1,4-benzoquinoneradical anion", INT J CH K, 33(7), 2001, pp. 397-401

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 spectralsimulation. The migration rates were found to be accelerated by increasingthe external pressure. Using the pressure dependence of the migration rates, we estimated the activation volumes of the intramolecular (DeltaV(1)(double dagger)) and intermolecular (DeltaV(2)(double dagger)) processes For the Na+ and K+ migrations: DeltaV(1)(double dagger) = -5.3 cm(3) mol(-1) and DeltaV(2)(double dagger) = -29 cm(3) mol(-1) for Na+, and DeltaV(1)(double dagger) = -8.3 cm(3) mol(-1) and DeltaV(2)(double dagger) = -0.85 cm(3) 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. (C) 2001 John Wiley & Sons,Inc.

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Documento generato il 02/04/20 alle ore 19:20:43