## solvophobicity parameter, $$Sp$$

https://doi.org/10.1351/goldbook.S05763
A @S05757@ defined by: $Sp = 1 - \frac{M}{M\left(\text{hexadecane}\right)}$ derived from the Gibbs energy of transfer ($$\Delta _{\text{t}}G^{\,\unicode{x26ac}}$$) of a series of solutes from water to numerous aqueous-organic mixtures and to pure solvents: $\Delta _{\text{t}}G^{\,\unicode{x26ac}}\left(\text{to solvent}\right) = M\ R_{\text{T}}+D$ where $$R_{\text{T}}$$ is a solute parameter, and $$M$$ and $$D$$ characterize the solvent. The $$M$$ values are used to define a solvent solvophobic effect so that $$Sp$$ values are scaled from unity (water) to zero (hexadecane).
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1165 [Terms] [Paper]