Vapor pressure studies of hydrophobic interactions. formation of benzene-benzene and cyclohexane-cyclohexanol dimers in dilute aqueous solution

摘要: A new, highly sensitive vapor pressure apparatus has been used to study very dilute solutions of benzene, cyclohexane, and mixtures cyclohexane cyclohexanol in water at temperatures from 15 45°C. The results have calculate the enthalpy, free energy, heat capacity transfer benzene phase into infinite dilution. Values equilibrium constant enthalpy change determined for reactions $$2{\text{ = (benzene)}}_{\text{2}} $$ (A) and $${\text{cyclohexane + }} \cdot {\text{ cyclohexanol}}$$ (B) occurring aqueous solution. Of particular interest is result that dimerization positive two association reactions [4.0±1.0 kcal-mol−1 reaction (A) 3.45±0.16 (B) 25°C]. −61±39 cal-K−1-mol−1. are discussed relation current theories descriptions hydrophobic interactions.