THERMODYNAMICS OF SOLUTION OF NON-MESOMORPHIC SOLUTES AT INFINITE DILUTION IN THE SMECTIC-A, NEMATIC AND ISOTROPIC PHASES OF PARA-NORMAL-OCTYL-PARA'-CYANOBIPHENYL - A GAS-LIQUID-CHROMATOGRAPHIC STUDY

From specific retention volumes measured at four temperatures in each of the three fluid phases of p-n-octyl-p'-cyanobiphenyl (8CB), infinite-dilution solute activity coefficients, partial molar excess enthalpies and entropies, and enthalpies and entropies of solution were determined for 21 solutes varying in molecular size, shape and flexibility. The reported results and their trends are discussed in terms of a previously proposed solution model. The results for 8CB are compared with those for the lower alkyl homologs in this liquid-crystalline solvent series, 5CB, 6CB and 7CB. The thermodynamic behavior within each of five solute groups is interpreted.