Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 21, Issue 33, Pages 18059-18064Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp03001h
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Funding
- Ministry of Science and Technology of Taiwan [MOST 104-2113-M-009-020, MOST 105-2811-M-009-026, 106-2811-M-009-023]
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The atmospheric reaction of the simplest Criegee intermediate, CH2OO, with formic acid has been investigated in the gas phase by pulsed Fourier-transform microwave spectroscopy. The dominant nascent product from this reaction was identified as hydroperoxymethyl formate (HOOCH2OCHO), for which two different conformations, formed through independent insertion mechanisms, were observed in the discharged plasma of a CH2I2/O-2/formic acid gas mixture. The conformational identifications are supported by the observation of C-13 species in natural abundance together with the chemically mono substituted deuterium isotopologues. These isotopic observations further suggest that hydroperoxymethyl formate slightly decomposes, producing formic anhydride (OHCOCHO) in a dehydration reaction.
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