24 May 2007 New 1-aryl-spiro[2,5]octan-4-ones as chiral components of induced short-pitch cholesterics
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Proceedings Volume 6637, XV International Symposium on Advanced Display Technologies; 66370F (2007); doi: 10.1117/12.742591
Event: XV International Symposium on Advanced Display Technologies, 2006, Moscow, Russian Federation
Abstract
New 1-(4X-phenyl)-spiro-octan-4-ones (X=F, Cl, Br, C6H5, C6H4C6H4OA1k) were synthesized to use for inducement of the helical supra-molecular structure with a short pitch under addition to the nematic liquid crystal (LC) 4-cyano-4'- pentylbiphenyle (5CB). Design of these spiro-compounds was accomplished by the replacement of a double bond in known chiral dopants of a series of isomenthone arylidene derivatives 1 by the cyclopropane ring that made them stable to photochemical E-Z- isomerization typical of initial enones 1. New dopants 2 exhibit the helical twisting power that only slightly reduced as compare to compounds 1. LC mixtures based on the E-63 nematic and containing the most effective 2 possess visible selective light reflection.
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T. G. Drushlyak, I. M. Gella, N. I. Shkolnikova, N. S. Pivnenko, N. B. Novikova, L. A. Kutulya, "New 1-aryl-spiro[2,5]octan-4-ones as chiral components of induced short-pitch cholesterics", Proc. SPIE 6637, XV International Symposium on Advanced Display Technologies, 66370F (24 May 2007); doi: 10.1117/12.742591; http://dx.doi.org/10.1117/12.742591
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KEYWORDS
Liquid crystals

Visible radiation

Bromine

X-ray diffraction

Chlorine

Crystals

Chromatography

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