Thermodn. results from gas-liq. chromatog. (GLC) are reported for three nonmesorphic solutes-nitrotoluene isomers in the nematic liquid crystal phases of two solvents PBHxB (p-phenylene bis-n-hexyloxybenzoate) and PBHpB (p-phenylene bis-n-heptyloxybenzoate). The specific retention vol. can be obtained from retention time. Infinite dilution solute activity coefficients are obtained at several temperature in two nematic phase. From these, the following solute partial molar quantities are determine in each phase: excess enthalpy, excess Gibbs free enthalpy, excess entropy, enthalpy of solution, and entropy of solution The results are discussed in terms of the mol. solute-solvent interactions.

Key words: THERMODYNAMIC PROPERTIES, GAS CHROMATOGRAPHY, SOLUTION, LIQUID CRYSTAL, NITROBENZENE P, ENTROPY, ENTHALPY, FREE ENERGY, ISOMER, BENZENEDIOL P