Abstract
Criegee intermediates, which are carbonyl oxides produced when ozone reacts with unsaturated hydrocarbons, play an important role in the formation of OH and organic acids in the atmosphere, but they have eluded direct detection until recently. Reactions that involve Criegee intermediates are not understood fully because data based on their direct observation are limited. We used transient infrared absorption spectroscopy to probe directly the decay kinetics of formaldehyde oxide (CH2OO) and found that it reacts with itself extremely rapidly. This fast self-reaction is a result of its zwitterionic character. According to our quantum-chemical calculations, a cyclic dimeric intermediate that has the terminal O atom of one CH2OO bonded to the C atom of the other CH2OO is formed with large exothermicity before further decomposition to 2H2CO + O2(1Δg). We suggest that the inclusion of this previously overlooked rapid reaction in models may affect the interpretation of previous laboratory experiments that involve Criegee intermediates.
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Acknowledgements
The National Science Council of Taiwan (grants NSC102-2745-M-009-001-ASP and NSC101-2113-M-009-002) and the Ministry of Education, Taiwan (‘ATU Plan’ of the National Chiao Tung University) supported this work. The National Center for High-Performance Computing provided computer time.
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Y-T.S. performed the experiments and analysed the data, H-Y.L. performed the kinetic simulations and R.P. performed the calculations. H.M. conceived and designed the kinetic analysis. M.C.L. conceived and designed the calculations. Y-P.L. conceived and designed the experiments and wrote a major part of the paper. H.M. and M.C.L. contributed to writing sections of the paper.
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Su, YT., Lin, HY., Putikam, R. et al. Extremely rapid self-reaction of the simplest Criegee intermediate CH2OO and its implications in atmospheric chemistry. Nature Chem 6, 477–483 (2014). https://doi.org/10.1038/nchem.1890
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DOI: https://doi.org/10.1038/nchem.1890
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