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Some homologs of ortho-, mela-, and/or para-substituted phenyl 1H, 1H, 2H, 2H-perfluorodecyl ethers have been synthesized. The most of para-substituted phenyl ethers show a smectic phase, while the pa...ra-long alkyloxycarbonylated derivatives are non-mesogenic. The ortho-or meta-substituted derivatives show a low liquid crystalline phase with a low clearing point. On the other hands, for the corresponding 1H, 1H, 2H, 2H-perfluoroalkyl benzoate systems, para-substituted benzoate derivatives are non-mesogenic and the lateral substituted ones are mesogenic. From these results, we conclude that in order to show liquid crystalline properties, the roles of the substituents and the perfluoroalkyl chain differ with the ether homologs and the ester homologs. For both systems, however, the rigidity and the linearity of the perfluoroalkyl group are a primary importance for displaying the liquid crystalline properties.show more
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KJ00004507790