Thermodynamics of Association for Benzene-Benzyl Alcohol, Benzene-Phenethyl Alcohol, and Fluorobenzene-Benzyl Alcohol in Dilute Aqueous Solution

Article abstract of DOI:10.1007/BF00645197

Vapor pressure measurements have been on dilute aqueous solutions of benzene-benzyl alcohol (BZOH), benzene-phenethyl alcohol (PEOH), and fluorobenzene-BZOH at 15, 25, 35, and 45 deg C.The benzene results have been interpreted with a mass action model which attributes deviations from ideality to the formation of benzene dimers and heterodimers with BZOH and PEOH.The benzene heterodimers form endothermically at 25 deg C with large and negative heat capacity changes.The dimerization constant for the benzene-BZOH dimer reaches a maximum of 0.57 M^-1 at about 37 deg C, while the benzene-PEOH dimer reaches a maximum of 0.60 M^-1 around 30 deg C.The fluorobenzene results have been interpreted with a mass action model which, in addition to fluorobenzene dimers and heterodimers, includes the formation of a fluorobenzene-BZOH trimer.Thermodynamic properties for these aggregates are reported and compared with results obtained in previous studies.