Abstract
The effectivity of solvents as electron pair donors, their donicity as expressed by their donor numbers DN, is reexamined. The linear dependence of the enthalpy and the Gibbs free energy for the reaction of donor solvents with antimony pentachloride is affirmed. Extension of the DN scale by other measured quantities, via their linear correlations for sets of solvents where both kinds of data are known is applied to Drago's E-C scale, Kamlet's β scale, and Koppel's B scale. This extension, added to previous extensions employing Selbin's DI, II and Popov's δ23Na, produces a DN scale for 170 solvents. The relation of DN measured for isolated solvent molecules in 1,2-dichloroethane to DN values measured for bulk solvents is examined by means of the scaled particle theory and solute-solvent interaction terms. A scale of normalized donor numbers DNN is presented. These values are practically the same as the β scale, and for those solvents for which DN values are presented here and β values are lacking, they can serve in their place for those preferring to use the β scale for donor solvents.
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Marcus, Y. The effectivity of solvents as electron pair donors. J Solution Chem 13, 599–624 (1984). https://doi.org/10.1007/BF00650369
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DOI: https://doi.org/10.1007/BF00650369