Abstract
Ab initio molecular orbital calculations at the G2 level of theory have been performed in order to determine the structure and gas phase energies of complexes formed by the Lewis bases NH 3, H 2O, H 2S, SiH 2 and their methyl derivatives with the cations Li +, Na + and Mg 2+. Calculated interaction energies vary as Mg 2+>>Li +>Na +. The relative basicities of the bases studied depend on both the substituent and the character of cation. The gas-phase interaction energies computed by the G2, G2(MP2) and G1 methods were comparable in accuracy. The binding energies computed by these three methods reach the targeted “chemical” accuracy.
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