Bonding Analysis of the [C2O4](2+) Intermediate Formed in the Reaction of CO22+ with Neutral CO2.
J PHYS CHEM A
6681 - 6688.
The bonding patterns of the [C2O4](2+) dication formed upon interaction of CO22+ with neutral CO2 are investigated using the analysis of domain-averaged Fermi holes (DAFHs). The DAFH approach provides an explanation for the previously observed "asymmetry" of the energy deposition in the pair of CO2+ monocations formed in the thermal reaction CO22+ + CO2 -> [C2O4](2+) -> 2 CO2+, specifically that the CO2+ monocation formed from the dication dissociates far more readily than the CO2+ monocation formed from the neutral molecule. The bonding pattern is consistent with a description of intermediate [C2O4](2+) as a complex between the triplet ground state of CO22+ with the singlet ground state of neutral CO2, which can, among other pathways, smoothly proceed to a nondegenerate pair of (CO2+)-C-4 + (CO2+)-C-2 where the former stems from the dication and the latter stems from the neutral reactant. Hence the "electronic history" of the components is retained in the [C2O4](2+) intermediate. In addition, dissociation of (CO2+)-C-4 is discussed based on CCSD and CASSCF calculations. Equilibrium geometries for the ground electronic states of CO20/+/2+ and some other relevant structures of CO2+ are determined using the MRCI method.
|Title:||Bonding Analysis of the [C2O4](2+) Intermediate Formed in the Reaction of CO22+ with Neutral CO2|
|Keywords:||AVERAGED FERMI HOLES, CHARGE-TRANSFER, CHEMICAL-BONDS, HYPERVALENT MOLECULES, COLLISION ENERGIES, ELECTRONIC STATES, DICATIONS, DISSOCIATION, COMPETITION, DYNAMICS|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
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