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- W2002256995 abstract "We report FTIR studies of the 193 nm photodecomposition of N-methylformamide (NMF) isolated in solid parahydrogen (pH2) matrices at 1.9 K. By studying the detailed photokinetics we can distinguish between primary and secondary photoproducts. We observe single exponential decay of the NMF precursor upon irradiation and identify three competing primary dissociation channels: HCO + NHCH3; H + CONHCH3; and CO + CH3NH2 with branching ratios of 0.46(7):0.032(8):0.51(6), respectively. Two of the primary photoproducts (NHCH3 and CONHCH3) are observed for the first time using IR spectroscopy and assigned via ab initio calculations of the vibrational frequencies and intensities of these radicals. The dominant radical formation channel HCO + NHCH3 is consistent with efficient C–N peptide bond fission at this wavelength and escape of the nascent radical pair from the pH2 solvent cage. The significant branching 0.51(6) measured for the molecular channel CO + CH3NH2 is unexpected and raises important questions about the details of the in situ photochemistry. Starting from the NMF precursor, we observe and characterize spectroscopically a wide variety of secondary photoproducts including CH2NH, HCN, HNC, HNCO, CH3NCO, CH4, and NH3." @default.
- W2002256995 created "2016-06-24" @default.
- W2002256995 creator A5038679655 @default.
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- W2002256995 date "2012-11-21" @default.
- W2002256995 modified "2023-10-14" @default.
- W2002256995 title "Photodissociation of N-methylformamide isolated in solid parahydrogen" @default.
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- W2002256995 doi "https://doi.org/10.1063/1.4765372" @default.
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