Solvation in Heterogeneous Media

Authored by: Bagchi Sanjib

Handbook of Surface and Colloid Chemistry Fourth Edition

Print publication date:  June  2015
Online publication date:  June  2015

Print ISBN: 9781466596672
eBook ISBN: 9781466596689
Adobe ISBN:

10.1201/b18633-8

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Abstract

Solute–solvent interactions play a key role in determining the observed kinetic, equilibrium, and spectroscopic properties of a solute in different media. Since most chemical and biological processes take place in solution, a detailed understanding of molecular interactions involving the solute and its immediate environment is required. It has long been known that physicochemical properties of a molecule (solute) depend considerably on the nature of the interacting molecules in its immediate environment. A solute molecule may be thought as a source of field that induces structural changes in a solvent. Three distinct regions may be distinguished around a solute molecule, namely, a primary region with completely oriented solvent molecules, a secondary region containing partially oriented solvent molecules, and a bulk region where the solvent molecules are not under the influence of the solute and normal distribution of solvent (as in pure solvent) prevails. The primary and the secondary regions where the influence of the solute is felt are commonly referred to as the cybotactic region [1]. The net molecular interaction taking place in this region is often referred to as solvation interaction. In dilute solutions, the nature of these interactions is mainly solute–solvent and solvent–solvent.

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