Specific features of solvation of lignin related phenols in the binary mixtures of water with dimethyl sulfoxide, 1,4-dioxane, and acetonitrile

The effect of the solvent composition in the binary mixtures of water with dimethyl sulfoxide, acetonitrile and 1,4-dioxane on the positions of absorption bands in the UV spectra of five guaiacylic phenols, as well as of the corresponding phenolate anions, simulating structural units of natural lignin macromolecules, was studied. The data obtained were interpreted based on the model of a stepwise solvent exchange in the solvation shells. Parameters of a preferential solvation and compositions of solvation shells of lignin related phenols were calculated. A determining role of water complexes with aprotic solvents in the solvation equilibria involving phenols under study was shown.