Limiting enthalpies of solution Delta(soln)H(o)(oct/w) of several monofunctional compounds (tetrahydropyran, diethylamine, pyrrolidine, piperidine, 1-methylpiperidine) in water-octan-1-ol mixtures with water content ranging from zero to saturation have been determined at 25 degrees C. The observed phenomenology has been interpreted by supposing that the solvent medium undergoes 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 suggested. Two different simple models have also been proposed to describe quantitatively the observed trends of Delta(soln)H(o)(oct/w) vs. mole fraction of water.

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

BERNAZZANI, LUCA;CABANI, SERGIO;CONTI, GIOVANNI;MOLLICA, VINCENZO
2000

Abstract

Limiting enthalpies of solution Delta(soln)H(o)(oct/w) of several monofunctional compounds (tetrahydropyran, diethylamine, pyrrolidine, piperidine, 1-methylpiperidine) in water-octan-1-ol mixtures with water content ranging from zero to saturation have been determined at 25 degrees C. The observed phenomenology has been interpreted by supposing that the solvent medium undergoes 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 suggested. Two different simple models have also been proposed to describe quantitatively the observed trends of Delta(soln)H(o)(oct/w) vs. mole fraction of water.
Bernazzani, Luca; Cabani, Sergio; Conti, Giovanni; Mollica, Vincenzo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/214215
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