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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 11, Number 4
BKCSDE 11(4)
April 20, 1990 

Synthesis and Liquid Crystalline Properties of Dimesogenic Compounds Containing Trifluoromethyl Substituents at Terminal Phenylene Rings and Central Decamethylene Spacer
Byung-Wook Jo, Jae-Kon Choi, Jung-Il Jin*, Bong-Yong Chung
A series of new dimesogenic compounds whose mesogens are of aromatic ester or amide type having a trifluoromethyl (CF3) substituent at the para-position of each terminal phenolic rings were prepared and their liquid crystalline properties were studied by differential scanning calorimetry (DSC) and on a cross-polarizing microscope. The compounds have two identical mesogenic units bracketing a central decamethylene spacer. Trifluoromethyl group appears to favor the formation of smectic phases when it is attached to a phenoxy or anilide terminal. Its group efficiency for mesophase formation seems to be inferior to other common substituents. A thermodynamic analysis of the phase transitions was made and the results were explained in relation to the structures of the compounds.
333 - 334
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