TY - JOUR
T1 - Calculations of the energies of the low-lying electronic states of dioxatrimethylenemethane (H2CCO2) and prediction of the negative ion photoelectron (NIPE) spectrum of its radical anion †
AU - Chen, Bo
AU - Hrovat, David A.
AU - Borden, Weston Thatcher
N1 - Publisher Copyright:
© 2017 John Wiley & Sons, Ltd.
PY - 2017/4
Y1 - 2017/4
N2 - In order to predict the energies of the low-lying electronic states of the dioxa derivative of trimethylenemethane (DOTMM), we have carried out (U)B3LYP, CASPT2, and (U)CCSD(T) calculations, using the aug-cc-pVTZ basis set. Our calculations predict that DOTMM has a triplet ground state, with one unpaired electron occupying a b2 σ MO and the other a b1 π MO. An open-shell singlet state, with the same orbital occupancy as the triplet, is calculated to lie very close to the 3A2 ground state. However, this open-shell singlet (1A2) is predicted to be the transition structure for methylene rotation and to lead to the barrierless formation of an equivalent pair of α-lactones. We also report the results of some calculations on the fragmentation of DOTMM to CH2 + CO2. Our predictions about DOTMM could be tested experimentally by generating the DOTMM•− radical anion in the gas phase and obtaining its negative ion photoelectron spectrum.
AB - In order to predict the energies of the low-lying electronic states of the dioxa derivative of trimethylenemethane (DOTMM), we have carried out (U)B3LYP, CASPT2, and (U)CCSD(T) calculations, using the aug-cc-pVTZ basis set. Our calculations predict that DOTMM has a triplet ground state, with one unpaired electron occupying a b2 σ MO and the other a b1 π MO. An open-shell singlet state, with the same orbital occupancy as the triplet, is calculated to lie very close to the 3A2 ground state. However, this open-shell singlet (1A2) is predicted to be the transition structure for methylene rotation and to lead to the barrierless formation of an equivalent pair of α-lactones. We also report the results of some calculations on the fragmentation of DOTMM to CH2 + CO2. Our predictions about DOTMM could be tested experimentally by generating the DOTMM•− radical anion in the gas phase and obtaining its negative ion photoelectron spectrum.
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U2 - 10.1002/poc.3594
DO - 10.1002/poc.3594
M3 - Article
AN - SCOPUS:85028283110
SN - 0894-3230
VL - 30
SP - 12
EP - 21
JO - Journal of Physical Organic Chemistry
JF - Journal of Physical Organic Chemistry
IS - 4
ER -