Abstract
Abstract The relation between a solvophobic interaction (SI) and a solute–solute radial distribution function is discussed. The SI is defined as the difference between the indirect part of the solute–solute potential of the mean force in a solvent and that in a “homomorphic” solvent. It was calculated using the RHNC-like integral equation of RISM-1 for a dilute solution of hard spheres in a solvent composed of polar hard dumb-bells. The existence of a SI was comfirmed in a simple system. The SI in this system proved to have originated from the effect of a dipole–dipole interaction between solvent molecules making the excluded volume of the solute molecules small. It was found that the strength of a SI decreases with increasing temperature. It was also shown that Ben-Nairn’s measure [J. Chem. Phys., 54, 1387 (1971)] gives an incorrect conclusion with respect to the temperature dependence of the SI of this system because it includes an excess factor irrelevant to a SI.
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