TY - JOUR
T1 - Detection of a Criegee Intermediate with an Unsaturated Hydrocarbon Substituent
T2 - Fourier-Transform Microwave Spectroscopy of Methyl Vinyl Ketone Oxide
AU - Endo, Yasuki
AU - Witek, Henryk Arnold
AU - Chung, Chen An
AU - Lee, Yuan-Pern
PY - 2020/7/30
Y1 - 2020/7/30
N2 - Pure rotational transitions of methyl vinyl ketone oxide, or the so called methyl-vinyl Criegee intermediate, were observed by Fourier-transform microwave spectroscopy. Among the four possible conformers of this species, predicted by theory within an energy window of 3 kcal/mol, only the lowest-energy conformer, the syn-trans form, was detected in a discharged jet of a 1,3-diiode-but-2-ene (either in Z- or E-conformation) and O-2 mixture diluted in Ar. Thirty pure rotational transitions with internal rotation splitting of the methyl top were observed. The observed frequencies were analyzed by the XIAM program, yielding an internal rotation barrier of 702.8(28) cm(-1), which reasonably agrees with a theoretical value of 680 cm(-1) determined with CCSD(T)/cc-pVTZ.
AB - Pure rotational transitions of methyl vinyl ketone oxide, or the so called methyl-vinyl Criegee intermediate, were observed by Fourier-transform microwave spectroscopy. Among the four possible conformers of this species, predicted by theory within an energy window of 3 kcal/mol, only the lowest-energy conformer, the syn-trans form, was detected in a discharged jet of a 1,3-diiode-but-2-ene (either in Z- or E-conformation) and O-2 mixture diluted in Ar. Thirty pure rotational transitions with internal rotation splitting of the methyl top were observed. The observed frequencies were analyzed by the XIAM program, yielding an internal rotation barrier of 702.8(28) cm(-1), which reasonably agrees with a theoretical value of 680 cm(-1) determined with CCSD(T)/cc-pVTZ.
KW - DIRECT KINETIC MEASUREMENTS
U2 - 10.1021/acs.jpca.0c05817
DO - 10.1021/acs.jpca.0c05817
M3 - Article
C2 - 32628026
SN - 1089-5639
VL - 124
SP - 6203
EP - 6206
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
IS - 30
ER -