Thermodynamic magnitudes of l-menthol/-acetonitrile and l-menthol/carbon tetrachloride binary mixture by VPO

In this paper we have studied the thermodynamic behaviour of l-menthol in acetonitrile and carbon tetrachloride by vapour pressure osmometry (VPO) in the temperature range 303-323 K. We have found that l-menthol behaves in a different way in both solvents. From osmotic coefficients we have calculated the excess functions of the system. In l-menthol/carbon tetrachloride we have found a great deviation from ideal behaviour, on the contrary, the deviation is very slight in the other system. This circumstance hinders the study of this system with VPO. The behaviour of l-menthol in carbon tetrachloride has been discussed as a function of molecular interactions. Finally, self-association phenomena have been detected. By means of theoretical models the association number has been calculated.