Synthesis and property of liquid crystalline 4-alkoxyl-4″-cyano-p-terphenyls
The synthesis of some new 4-alkoxyl-4″-cyano-p-terphenyls is described. The preliminary characterization by means of polarized optical microscopy, differential scanning calorimetry and X-ray diffraction shows that all these compounds are thermotropically liquid-crystalline and can form both the nematic and smectic mesophases.
Mesomorphic Properties of n-Alkyl-4'-n-Pentanoyloxy-Biphenyl-4-Carboxylates
Esters in the homologous series n-alkyl-4'-n-pentanoyloxy-biphenyl-4-carboxylates (n4COOBC, n=1-12) have been synthesized.Mesomorphic properties and phase transitions have been determined using polarizing hot-stage microscopy, DSC and x-ray.Phase transitions from SA-SB crystal and hexatic (tentatively) have been observed.The relationship between the incidence of hexatic phase and molecular structure has been discussed.
Surendranath, V.,Fishel, D. L.,Vries, A de,Mahmood, R.,Johnson, D. L.
p. 1 - 8
(2007/10/02)
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