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Muonium reactions with chloroacetic acid in water: Contrasts with H atoms and hydrated electrons

TitleMuonium reactions with chloroacetic acid in water: Contrasts with H atoms and hydrated electrons
Publication TypeJournal Article
Year of Publication1997
AuthorsStadlbauer, JM, Venkateswaran, K, Walker, DC
JournalRadiation Physics and Chemistry
Volume50
Pagination259-262
Date PublishedSep
Type of ArticleArticle
KeywordsADDITION-REACTIONS, AQUEOUS-SOLUTIONS, HYDROGEN-ATOMS, radicals, RATE CONSTANTS, SPIN ROTATION
Abstract

Muonium atoms react with chloroacetic acid and chloroacetate ions in dilute aqueous solution with rate constants of 2.3 x 10(6) and 9.1 x 10(5) dm(3) mol(-1) s(-1) respectively. These are compared with the reactions of H-1 atoms (and e(aq)(-)) and discussed in terms of a pair of competing kinetic isotope effects. Muonium reacts at least eight times faster than H overall, and probably 28 times faster in forming Cl-. It behaves as a nucleophile, thus resembling e(aq)(-) more than H, in reacting faster with the acid than the anion. Muonium’s reactions must be governed to a considerable extent by quantum-mechanical effects arising from its very small mass. (C) 1997 Elsevier Science Ltd.

URL<Go to ISI>://A1997YG67900009