Abstract
ABSTRACT New non-conventional Schiff base trimers composed of two fluorinated benzylideneaniline moieties connected to a halogen-substituted benzalideneaniline core at the ortho and para positions via octylene spacers were synthesized and characterized. The halogen X at the 4-position of the benzalideneaniline core includes F, Cl, Br and I. All the members exhibit enantiotropic nematic phase except for the compounds possessing fluorine and iodine substituents, which show only monotropic characteristics. A notable feature is that upon cooling the trimers vitrified to form the glassy state at low temperature. The Schlieren texture remains unchanged even it reaches the room temperature. This phenomenon resembles the one exhibited by glassy nematic liquid crystals and the enthalpy changes associated with the nematic to glass transition are unresolved due to the negligible value of heat change. The effect of different halogens towards the mesomorphic properties of the trimers was also described.
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