Abstract
AbstractThe potential energy curves for the intermolecular proton transfer in complementary base pairs and respective hydrogen bonded model systems have been studied at the semiempirical all‐valence and ab initio STO‐3G level. The proton transfer probability was found to be markedly greater in excited electronic states than that of the ground state. Substantial lowering of the potential barrier height for the coupled double proton transfer in model (HCOOH)2 system has been observed when the dynamics of zero‐point vibrational deformations of the heavy atom skeleton and the environmental effects were taken into account in nonempirical STO‐3G calculations. The results of quantum‐chemical calculations indicate on the possibility of the double proton transfer in complementary base pairs corroborating the submolecular Löwdin hypothesis on the mechanism of spontaneous mutations.
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