Synthesis and Surface Characterizations of New Banana-Shaped Liquid Crystal 4-Bromo-1,3-phenylene-bis[4-[4′-(10- undecenyloxy)-benzoyloxy]]benzoate

Abstract

Abstract A new banana-shaped liquid crystal compound, i.e., the bent-core mesogen, 4-Bromo-1,3-phenylene-bis[4-[4′-(10-undecenyloxy)-benzoyloxy]]benzoate (BPUBB), has been synthesized and characterized. Phase transition temperatures of BPUBB were determined by polarizing microscopy and differential scanning calorimetry. The inverse gas chromatography method was utilized to obtain the surface characterization of BPUBB. This compound was used as a stationary phase in the chromatographic column and nine solutes with a different chemical nature were used as eluents. The dispersive component of the surface free energy, γ D S , of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. The specific free energy of adsorption, ΔGS A , the enthalpy of adsorption, ΔHS A , and the entropy of adsorption, ΔSS A , of solvents on liquid crystal were determined. The values of the ΔHS A were correlated with both the donor and the acceptor numbers of the probes to quantify the acid KA and the basic KD parameters of the liquid crystal surface. The values obtained for the KA and KD parameters indicated a basic character for the surface of the BPUBB. Keywords: Inverse gas chromatographyLewis acid-base constantsliquid crystalssurface and adsorption propertiessurface free energies Acknowledgment This research has been supported by the Yildiz Technical University Scientific Research Projects Coordination Department.