The statistical mechanical expression relating the solubilities of d- and l-optical isomers in optically active solvent is derived.
It is shown that there exists a difference between these two solubilities.
The possibility of optical resolution is also discussed.
The heats of mixing were measured for 22 binary systems of polar and non-polar liquids where the pairs of liquids have similar molecular sizes.
For the systems in which the non-polar components are non-aromatic, the van Laar coefficients α are positive and increase smoothly as the concentration of polar liquids decrease. This variation of α with concentration is attributed to the effect of dipole of the polar component.
However, for the systems where the nonpolar components are aromatic, the values of α are smaller than that of the corresponding non-aromatic system and are even negative for most of the cases and decrease with concentration of polar component in most concentration ranges.
The sharp difference between two groups of the binary systems, was attributed to the structural difference of aromatic and non-aromatic non-polar components.
The effect presumably due to the quadrupole of the non-polar components was noticed.
A microcalorimeter of the twin type has been constructed, one which is operated semiautomatically. Using this apparatus, the heats of mixing for alcohol-ketone, alcohol-hexane, and ketone-hexane solutions have been measured. From these heats of mixing, the hydrogen bond energy of the O–H…O= type has been estimated to be about 4kcal. by means of the thermochemical cycle.
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