The Abraham linear free energy relationship, or solvation equation, has been applied to literature data on the partition of nonelectrolytes in the water to o-nitrophenyl octyl ether (NPOE) system. The resulting equation is compared to equations for other water to solvent systems using the D-parameter of Abraham and Martins and the θ-parameter of Ishihama and Asakawa. It is shown that as a solvent in partitioning systems, NPOE quite resembles nitrobenzene and 1,2-dichloroethane, and that the latter does not resemble an alkane-like solvent. Using descriptors for simple ions that we have previously obtained, we show that ions and nonelectrolytes can be included in the same linear free energy relationship.
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