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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 11, Number 3
BKCSDE 11(3)
March 20, 1990 

Synthesis and Liquid Crystalline Properties of the Compounds Consisting of a Schiff Base Type Mesogen and a Dyad Type Aromatic Ester Structure Interconnected Through the Central Hexamethylene Spacer
Jung Il Jin*, Hyo Seok Kim, Jin Wook Shin, Bong Young Chung, Byung Wook Jo
A series of compounds consisting of 4'-oxybenzylidene-4-n-butylaniline, a mesogen, and a p-substituted phenoxyterephthaloyl structure a non-mesogen, interconnected through a central hexamethylene spacer were synthesized and their thermal behavior and liquid crystallinity were studied. p-Substituents included in this study are H, Cl, CN, NO2, n-C4H9O and phenyl groups. The compounds having phenyl and n-C4H9O substituents are enantiotropic and form smectic-A(SA) and nematic (N) phases. The compound with NO2 substituent is monotropic and forms only a nematic phase on heating the solid, whereas it forms nematic as well as SA phases on cooling the isotropic liquid. The rest compounds were found to be non-liquid crystalline. This is in great contrast to the fact that the monomesogenic model compound 4'-n-hexyloxybenzylidine-4-n-butylaniline forms SB, SC, SA and N phases enantiotropically.
209 - 214
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