Solvation of benzene, aniline and nitrobenzene in the mixtures of water with oxygen-containing H-bond acceptors — a calorimetric study

Abstract

We have studied the energetics of solvation of benzene (C 6 H 6 ), nitrobenzene (C 6 H 5 NO 2 ) and aniline (C 6 H 5 NH 2 ) in the mixtures of water with oxygen-containing H-bond acceptors — acetone (Me 2 CO), 1,4-dioxane (DO) and dimethylsulfoxide (DMSO). The enthalpies of solution determined calorimetrically at 298 K have been used to study the pair interaction between aromatic solutes and their groups with H-bond acceptors in water and with water in pure aprotic non-aqueous solvents. The general trends occurring for enthalpies of solute transfer and enthalpies of pair interactions are discussed. • Energetics of solvation of aromatic solutes in water–H-acceptor mixtures was studied. • Enthalpies of transfer and enthalpic parameters of pair interaction were computed. • Nitro- and amino group revealed opposite behavior in aqueous H-acceptor solutions. • Linear correlation between solvent basicity and energetics of amino group solvation was found.