This paper examines in some detail the e ect of introducing the oxadiazole fragment into the molecular core of liquid crystals on their physico-chemical properties. The results of this study are compared with those obtained for other molecular fragments, and are rationalized in terms of existing theories.
A series of new liquid crystalline compounds with BCH-and CBC-structures was synthesized. They differ from the known carbocyclic analogs by the 1,2,4-oxadiazole fragment placed in various positions of the long mesomorphic molecule. The cross-coupling reaction of the aromatic boric acids and bromides is a new way for mesogenic heterocycles design. The transition temperatures of these new liquid crystals are lower as compared with carbocyclic BCH-and CBC-analogs and significantly depend on the position of the nonlinear heterocyclic unit in the molecular chain.
New liquid crystalline oxadiazoles containing terminal CI-group and phenylcyclohexane fragment together with their biphenyl analogues have been synthesized and investigated by DSC and polarizing microscopy. There is a direct dependence of results obtained on the central heterocyclic structure and the character and position of the substituent related to the asymmetrical heterocyclic unit.
With several methods, a large number of liquid crystalline compounds were obtained, which contained a cyclohexane fragment with a lateral methyl substituent. IJovel mesogena were studied for chemical, physioochemical, and mesomorphic properties.
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