Thermodynamic excesses and the diffusion-controlled relaxation in the liquid system propan-2-ol-cyclohexane

► Positive excesses of volume and expansion of propan-2-ol + cyclohexane due to steric mismatch of the molecules. ► Positive excess enthalpy due to breaking of the H-bonds. ► Movements of propan-2-ol molecules hampered in dilute solutions. ► Long relaxation times in the mixtures containing ca. 1.5 mol% of propan-2-ol.