The values of the enthalpy changes for the transfer of some open-chain and cyclic bifunctional organic compounds (diethers, diamines, aminoethers) from gas state to dilute solution in octan-1-ol have been obtained by the enthalpies of vaporisation of the pure solutes and the limiting enthalpies of solution in octanol. These data have been combined with the known values of the enthalpy of solvation in water, and the values of enthalpy of the transfer process from pure water to pure octan-1-ol have also been calculated. From an analysis of these data, it emerges that: the enthalpies of solvation in water and in octan-1-ol are linearly related and distinctive values were obtained for the slopes of the two straight lines which connect bifunctional open-chain and cyclic compounds; the enthalpies of transfer from water to octanol are always endothermic and linearly related to the intrinsic volumes of the solutes, irrespective of whether they have an open-chain or a cyclic structure. The enthalpy changes for the transfer from gas to aqueous or alcoholic solution, or for the transfer from water to octan-1-ol, have been related to the molecular structure of the solutes.
Thermodynamic Study of Organic-compounds In Octan-1-ol .3. Enthalpy Effects Connected With the Partitioning of Some Bifunctional Compounds Between Water and Octan-1-ol
CABANI, SERGIO;CONTI, GIOVANNI;MOLLICA, VINCENZO;
1990-01-01
Abstract
The values of the enthalpy changes for the transfer of some open-chain and cyclic bifunctional organic compounds (diethers, diamines, aminoethers) from gas state to dilute solution in octan-1-ol have been obtained by the enthalpies of vaporisation of the pure solutes and the limiting enthalpies of solution in octanol. These data have been combined with the known values of the enthalpy of solvation in water, and the values of enthalpy of the transfer process from pure water to pure octan-1-ol have also been calculated. From an analysis of these data, it emerges that: the enthalpies of solvation in water and in octan-1-ol are linearly related and distinctive values were obtained for the slopes of the two straight lines which connect bifunctional open-chain and cyclic compounds; the enthalpies of transfer from water to octanol are always endothermic and linearly related to the intrinsic volumes of the solutes, irrespective of whether they have an open-chain or a cyclic structure. The enthalpy changes for the transfer from gas to aqueous or alcoholic solution, or for the transfer from water to octan-1-ol, have been related to the molecular structure of the solutes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
