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Abstract
A number of mesomorphic 4-alkylamino-4'-cyanobiphenyls were synthesized. These compounds melt at higher temperatures and form nematic and smectic A state with higher thermal stability than that of analogous 4-alkoxy-4'-cyanobiphenyls. 4-Octylamino-4'-cyanobiphenyl is characterized by a significantly higher dielectric anisotropy in comparison with its 4-octyloxy analogue, in the nematic state, but not in the smectic state. Density data and refractometric indices of several 4 substituted 4'-cyanobiphenyls are presented; refractometric data confirm higher polarizability of 4-alkylamino-4'-cyanobiphenyls as compared with their 4-alkoxy analogues.