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Titolo:
Proton affinities of two weakly bidentate molecules: 1,2-dimethoxyethane and methoxyacetone
Autore:
Morlender-Vais, N; Holmes, JL;
Indirizzi:
Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada Univ Ottawa Ottawa ON Canada K1N 6N5 ept Chem, Ottawa, ON K1N 6N5, Canada
Titolo Testata:
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
fascicolo: 1-3, volume: 210, anno: 2001,
pagine: 147 - 152
SICI:
1387-3806(20011001)210:1-3<147:PAOTWB>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
KINETIC METHOD; THERMOCHEMICAL DETERMINATIONS;
Keywords:
proton affinity; 1,2-dimethyloxyethane; methoxyacetone; kinetic method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Holmes, JL Univ Ottawa, Dept Chem, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada Univ Ottawa 10 Marie Curie Ottawa ON Canada K1N 6N5 6N5, Canada
Citazione:
N. Morlender-Vais e J.L. Holmes, "Proton affinities of two weakly bidentate molecules: 1,2-dimethoxyethane and methoxyacetone", INT J MASS, 210(1-3), 2001, pp. 147-152

Abstract

The proton affinities (PA), of methoxyacetone and 1,2-dimethoxyethane havebeen determined by the kinetic method, using alkyl ethers and simple ketones having established PA values as their proton bound partners. Both compounds show effects attributed to activation entropies acting against the target molecules' retaining the proton. The PA values determined in this study were, PA methoxyacetone = 846.5 +/- 2 kJ/mol; PA 1,2-dimethoxyethane = 845.5 +/- 2 kJ/mol, (which is considerably lower than the previously cited value, 858 kJ/mol). The PA of cyclopentanone was revised to 828 +/- 4 kJ/mol from its reference value of 824 kJ/mol. The present work showed that simple ketones and ethers, whose PA values conveniently overlap, cannot indiscriminately be used as reference compounds; care must always be taken in the choice of the proton bound partner (reference) molecule in kinetic method studies. (C) 2001 Elsevier Science B.V.

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Documento generato il 27/05/20 alle ore 13:24:50