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Title: Banana-shaped mesogens derived from 2,7-dihydroxynaphthalene and 1,3-dihydroxybenzene: novel columnar mesophases
Authors: Reddy, Amaranatha R.
Sadashiva, B.K.
Raghunathan, V.A.
Issue Date: Sep-2004
Publisher: American Chemical Society
Citation: Chemistry of Materials, 2004, Vol.16, p4050
Abstract: The synthesis and mesomorphic properties of a number of compounds belonging to different homologous series and derived from 2,7-dihydroxynaphthalene are described. In addition, several compounds derived from 1,3-dihydroxybenzene have also been synthesized for comparison. All these compounds are relatively stable esters of E-p-n-alkoxycinnamic acids and E-p-n-alkoxy--methylcinnamic acids which are incorporated in the arms of these bent-core compounds. Many of these compounds show interesting mesophases including a novel antiferroelectric columnar phase with a rectangular lattice. Direct transitions from a rectangular columnar B1 phase, an antiferroelectric B2 phase, and an intercalated B6 phase to a nematic phase have also been obtained. In addition, a direct transition from a novel columnar phase with an oblique lattice to a nematic phase has also been observed for the first time. The X-ray diffraction pattern of an oriented sample of the mesophase with an oblique lattice exhibited by a bent-core material has been reported for the first time. The possibility of a mesophase with a pseudo hexagonal lattice has also been demonstrated in bent-core compounds. The nematic phase has been obtained exclusively in compounds derived from 2,7-dihydroxynaphthalene. The influence of the central core as well as that of a fluorine substituent on the phenyl rings in the sidearms of these bent-core compounds has also been examined. The mesophases have been characterized using conventional techniques.
Description: Restricted Access.
ISSN: E-ISSN: 1520-5002
P-ISSN: 0897-4756
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Copyright: 2004 The American Chemical Society
Appears in Collections:Research Papers (SCM)

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