Discotic Nematic Liquid Crystals Research Articles

Statistical mechanical theory for discotic liquid crystals Discotic nematic-isotropic transition properties

Abstract A statistical mechanical theory is applied to study the equilibrium properties of discotic nematic liquid crystals. We report the calculation of thermodynamic properties for a model system composed of molecules interacting through angle-dependent pair potentials which can be broken up into rapidly varying short-ranged repulsions and weak long-range attractions. The repulsive interaction is represented by a repulsion between hard oblate ellipsoids of revolution and is a short-range, rapidly-varying, potential. The influence of attractive potentials, represented by dispersion and quadrupole interactions on a variety of thermodynamic properties is analysed. It is found that the thermodynamic properties for the discotic nematic-isotropic transition are highly sensitive to the form of effective one-body orientational perturbation potential. The discontinuity in the transition properties is more pronounced in the case of quadrupole interaction than for anisotropic dispersion interaction. A remarkable s...

ChemInform Abstract: Liquid‐Crystalline Compounds. Part 43. Hexaalkylnylbenzene Derivatives, the First Hydrocarbons as New Columnar or Nematic Discotic Liquid Crystals.

AbstractPd(II)‐catalyzed coupling of hexabromobenzene (I) with the terminal alkynes (II) yields the hexaalkynylbenzenes (III).