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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 12, Number 2
BKCSDE 12(2)
February 20, 1991 

Importance of the Role of Flexible Spacers in Liquid Crystal Formation by Bent Dimesogenic and Star-Shaped Trimesogenic Compounds
Jung-Il Jin*, Bong Young Chung, Jae-Kon Choi, Byung-Wook Jo
A series of compounds that contain varying numbers of the same mesogenic structure, biphenyl p-oxybenzoate unit, attached through a pentamethylene spacer to the central benzene ring were prepared and their liquid crystallinity was studied. The mesophase-forming ability of a dimesogenic compound was found to be greatly dependent on whether or not its geometric shape is linear and also on the existence of the pentamethylene spacer between the mesogen and the central core. The presence of the spacer enhanced the capacity of a compound to form a mesophase. In the trimesogenic compound the mesogens were linked to the 1,3,5-positions of the core benzene ring through the spacer. The compound was found to be enantiotropically nematic.
189 - 193
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