Abstract
Abstract Molecular and bulk solvent properties of protic and aprotic solvent molecules were discussed in the respects of donor numbers (DN) and acceptor numbers (AN) proposed recently by Gutmann, and the intrinsic molecular properties obtained from gas-phase ion equilibria measurements. For aprotic solvent molecules, good correlations are generally found between the gas-phase thermochemical data and both of DN and AN. This indicates that DN and AN for aprotic solvents well reflect the intrinsic molecular properties. On the other hand, the correlations for H2O and lower alcohols are not good. This is due to the more effective enhancement effect in the intermolecular interactions for protic solvents than for aprotic solvents.
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