Abstract
Abstract The results of an approximate molecular orbital (MO) calculation of the interaction energy of the ring-opening of ethylene oxide by a hydride ion are presented. The method of calculation is based upon the isolated-molecule approximation. The interaction energy was divided into the Coulomb, exchange, delocalization, and polarization interaction terms, and the changes in these four terms with the progress of the reaction were investigated. The wave function of the combined system of ethylene oxide and a hydride ion was obtained by the configuration interaction (CI) procedure. The changes in the electron populations of ethylene oxide and the hydride ion were calculated from the ground-state CI wave function. Among the unoccupied MO’s of ethylene oxide, two low-lying unoccupied MO’s were shown to be of special importance in the electron transfer from the attacking anion to ethylene oxide. The effect of the deformation of the molecular shape upon the interaction energy and the intermolecular bond formation is also discussed.
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