A selected ion flow tube study of the ion molecule association reactions of protonated (MH+), nitrosonated (MNO+) and dehydroxidated (M-OH)(+) carboxylic acids (M) with H2O

0434377 - ÚFCH JH 2015 RIV NL eng J - Článek v odborném periodiku
Brůhová Michalčíková, R. - Španěl, Patrik
A selected ion flow tube study of the ion molecule association reactions of protonated (MH+), nitrosonated (MNO+) and dehydroxidated (M-OH)(+) carboxylic acids (M) with H2O.
International Journal of Mass Spectrometry. Roč. 368, JUL 2014 (2014), s. 15-22. ISSN 1387-3806. E-ISSN 1873-2798
Grant CEP: GA ČR GA13-28882S
Institucionální podpora: RVO:61388955
Klíčová slova: ion molecule reactions * proton transfer * selected ion flow tube mass spectrometry
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 1.972, rok: 2014

A selected ion flow tube, SIFT, study has been carried out of the reactions of H3O+, NO+ and O-2(+center dot) with four carboxylic acids: formic acid, acetic acid, propionic acid and butyric acid. Ethanol was also included in order to provide data that could facilitate SIFT-MS analyses of formic acid in its presence. The product ion branching ratios of the primary reactions were obtained and compared with the already known values, thus improving the certainty of kinetic data for quantification of these compounds. The primary products of the H3O+ reactions, the protonated molecules MH+, and the primary products of the NO+ reactions, nitrosonated (MNO+) and dehydroxidated (M-OH)(+) molecules, are observed to react with the molecules of water by three body association. Original data were obtained for the kinetics of these cluster-forming reactions. The three body rate constant for the associations of MH+ with H2O in He have been determined in the units of 10(-27) cm(3) s(-1) for formic, acetic, propionic and butyric acids as 1.4, 2.4, 3.8 and 4.9, respectively. The three body rate constant for the associations of MNO+ with H2O in He were obtained in the same units as 2.1, 1.1, 0.15 and 0.7. Results will improve the certainty of identification and accuracy of quantification of vapors of carboxylic acids by SIFT-MS in medical and food science research. (C) 2014 Elsevier B.V. All rights reserved.
Trvalý link: http://hdl.handle.net/11104/0238442