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• W2022036454 startingPage "597" @default.
• W2022036454 abstract "Atmospheric photochemistry induced by solar excitation of vibrational overtone transitions has recently been demonstrated to be of importance in cleaving weak bonds (in HO2NO2) and inducing intramolecular rearrangement followed by reaction (in H2SO4). Here, we propose another potentially important process: the decarboxylation of organic acids. To demonstrate this possibility, we have calculated the decarboxylation pathways for malonic acid and its monohydrate. The barrier to the gas-phase decarboxylation was calculated to be in the range 26−28 kcal/mol at the B3LYP/6-311++G(3df,3pd) level of theory, in good agreement with previous results. The transition state is a six-membered ring structure which is accessed via concerted O−H and C−C stretches; excitation of vOH ≥ 3 of either one of the OH stretching modes is sufficient to supply the energy needed for the decarboxylation. A low-energy isomer of the malonic acid−water complex forms an eight-membered, multiply hydrogen bonded structure, bound by 3−6 kcal/mol, somewhat less stable than the lowest energy, six-membered ring isomer. Decarboxylation of such complexes uses water as a catalyst; the water accepts an acidic proton from one malonic acid group and transfers a proton to the carbonyl of the other acid group. The barrier for this process is 20−22 kcal/mol, suggesting that complexes excited to vOH ≥ 2 possess sufficient energy to react. Using estimated absorption cross sections for the OH overtone transitions, we suggest that the overtone-induced decarboxylation of malonic acid and its water complex is competitive with wet deposition of the acid and with gas-phase reaction with OH for removal of the acid." @default.
• W2022036454 created "2016-06-24" @default.
• W2022036454 creator A5032409758 @default.
• W2022036454 creator A5054572408 @default.
• W2022036454 creator A5064336113 @default.
• W2022036454 date "2005-01-06" @default.
• W2022036454 modified "2023-09-27" @default.
• W2022036454 title "Overtone-Induced Decarboxylation: A Potential Sink for Atmospheric Diacids" @default.
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• W2022036454 doi "https://doi.org/10.1021/jp046141v" @default.
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