Stretching modes of unbound hydroxyl and sulfoxide groups, as well as intermolecular and intramolecular interactions of hydroxyl and sulfoxide groups, depending on concentration were recorded by IR spectroscopy in dilute solutions of asphaltite in the presence of the polar solvent chloroform. In the presence of the nonpolar solvent carbon tetrachloride, which exhibits a low level of exchange interaction, the IR spectrum displays only absorption of stretching modes of hydroxyl and sulfoxide groups bound by weak intermolecular interaction.