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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 9, Number 2
BKCSDE 9(2)
February 20, 1988 

 
Title
A True Cholesteric Columnar Liquid Crystal
Author
Iwhan Cho*, Youngsoo Lim
Keywords
Abstract
A pure columnar cholesterogen based on the octasubstituted phthalocyanine (PcH2), S-(+)-2, 3, 9, 10, 16, 17, 23, 24-octakis[5-(dodecyloxy)-2-oxa-pentyl]-phthalocy anine(1a), is described. To evaluate a cholesteric character of 1a, the corresponding achiral PcH2 1b and the copper complex of chiral PcH2 1a (CuPc), S-(+)-2,3,9,10,16,17,23,24-octakis[4-(dodecyloxy)- 2-oxapentyl]-phthalocyanine(2a) were also prepared. The chiral 1a exhibited a typical cholesteric texture change in which the transition of platelet (blue phase) to fan-shape texture was observed (K-M-I), whereas the corresponding achiral 1b showed only a focal conic texture (K- M-I). This is the first instance of a pure columnar cholesterogen observed with discotic liquid crystal systems.
Page
98 - 101
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