Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids.

Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids. Research Abstract Details 

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Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids. Abstract Text:

Beike Jia,Laurence A Angel,Kent M Ervin,

Energy-resolved competitive collision-induced dissociation is used to investigate the proton-bound heterodimer anions of a series of carboxylic acids (formic, acetic, and benzoic acid) and nitrous acid with their conjugate bases. The dissociation reactions of the complexes [CH3COO.H.OOCH]-, [CH3COO.H.ONO]-, [HCOO.H. ONO]-, [C6H5COO.H.OOCH]-, and [C6H5COO.H.ONO]- are investigated using a guided ion beam tandem mass spectrometer. Cross sections of the two dissociation channels are measured as a function of the collision energy between the complex ions and xenon target gas. Apparent relative gas-phase acidities are found by modeling the cross sections near the dissociation thresholds using statistical rate theory. Internal inconsistencies are found in the resulting relative acidities. These deviations apparently result from the formation of higher-energy conformers of the acids within the complex ions induced by double hydrogen bonding, which impedes the kinetics of dissociation to ground-state product acid conformations.

Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids. Publishing Authors By Initials

B Jia,LA Angel,KM Ervin,

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Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The journal of physical chemistry. A

VOLUME: 112

Page Numbers: 1773-82

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ISSN: 1089-5639

DAY: 31

MONTH: 01

YEAR: 2008

Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids. Information

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LANGUAGE: eng

NlmUniqueID: 9890903

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Grant and Affiliation Information for Threshold collision-induced dissociation of hydrogen-bonded dimers of carboxylic acids.

AFFILIATION: Department of Chemistry and Chemical Physics Program, University of Nevada, Reno, 1664 North Virginia Street MS 216, Reno, Nevada 89557-0216.

Country: United States

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MEDLINETA: J Phys Chem A

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