Enthalpies of solution of organic compounds in water/octan-1-ol mixtures. A rationale based an a model of structural organization of the solvent medium
L. Bernazzani et al., Enthalpies of solution of organic compounds in water/octan-1-ol mixtures. A rationale based an a model of structural organization of the solvent medium, J SOL CHEM, 29(4), 2000, pp. 389-404
Limiting enthalpies of solution Delta(soln)H(o)(oct/w) of several monofunct
ional compounds (tetrahydropyran, diethylamine, pyrrolidine, piperidine, 1-
methylpiperidine) in water-octan-1-ol mixtures with water content ranging f
rom zero to saturation have been determined at 25 degrees C. The observed p
henomenology has been interpreted by supposing that the solvent medium unde
rgoes a microphase transition at water mole fraction of about 0.08. In the
water-poor region the experimental behavior is consistent with the presence
of water molecules in prevailingly monodispersed form, while in the water-
rich region the formation of organized pseudomicellar water aggregates is s
uggested. Two different simple models have also been proposed to describe q
uantitatively the observed trends of Delta(soln)H(o)(oct/w) vs. mole fracti
on of water.