2C02 三環性液晶化合物のスメクチック性に及ぼす置換基の効果

抄録

The substituent effect on liquid crystalline properties for 4-R-phenyl 4-(4-octyloxybenzoyloxy)-benzoates, 4-octyloxyphenyl 4-(4-R-benzoyloxy)benzoates, 4-(4-octyloxybenzoyloxy) phenyl 4- R-benzoates, and 4-octyloxyphenyl 4-R-phenyl terephthalates (R=alkoxy, halogens, CF_3, OCF_3, NO_2, CN, and so on) has been examined. The layer spacing for the smectic A phase was determined by an X-ray diffraction experiment, indicating that the smectic A phases for the long alkyl and alkoxy derivatives have a monolayer arrangement, and those for the others have a partially bilayer one, where the ratios of the layer spacing to the molecular length are fairly dependent on the electrostatic nature of the substituent rather than the relative orientation of the ester linkages.