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

- 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.

We have studied the energetics of solvation of benzene (C6H6), nitrobenzene (C6H5NO2) and aniline (C6H5NH2) in the mixtures of water with oxygen-containing H-bond acceptors - acetone (Me2CO), 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.