期刊
LIQUID CRYSTALS
卷 31, 期 4, 页码 567-578出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290410001666093
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The synthesis and liquid crystalline properties of several new compounds unsymmetrically substituted about two different central phenyl rings are reported. All the compounds contain a strongly polar terminal cyano/nitro substituent. Some of the nitro-substituted compounds derived from 3-hydroxybenzoic acid show a transition from the partial bilayer uniaxial smectic A (SmA(d)) phase to a polar partial bilayer biaxial smectic A (SmA(d)P(A)) phase. The analogous cyano-substituted derivatives exhibit only a SmAd phase. However, compounds containing a 4-cyanobiphenyl moiety in the terminal position and derived from 1,3-dihydroxybenzene show the SmA(d) - SmA(d)P(A) transition. The mesophases were characterized using polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction studies, conoscopic examination and miscibility studies.
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