Novel ferroelectric and antiferroelectric smectic and columnar mesophases in fluorinated symmetrical bent-core compounds

Amaranatha Reddy, R.; Raghunathan, V.A.; Sadashiva, B.K.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2244

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DC Field	Value	Language
dc.contributor.author	Amaranatha Reddy, R.	-
dc.contributor.author	Raghunathan, V.A.	-
dc.contributor.author	Sadashiva, B.K.	-
dc.date.accessioned	2007-04-05T11:29:06Z	-
dc.date.available	2007-04-05T11:29:06Z	-
dc.date.issued	2005	-
dc.identifier.citation	Chemistry of Materials, 2005, Vol.17, p274 -283,	en
dc.identifier.issn	0897-4756	-
dc.identifier.uri	http://hdl.handle.net/2289/2244	-
dc.description	Restricted Access.	en
dc.description.abstract	We report the synthesis and mesomorphic properties of new bent-core (BC) mesogens exhibiting novel antiferroelectric switching columnar phases with rectangular as well as oblique lattices. The homologues with short chains show typical nonswitchable rectangular columnar (B1) phase and a ferroelectric switching smectic phase is obtained for the middle homologues. Interestingly, with increasing chain length, the switchable columnar phases are induced and the X-ray diffraction pattern with well-oriented samples indicates the presence of rectangular and oblique lattices. On the basis of the experimental observations, possible models have been proposed for these phases. Field-induced SmCSPF and Mx phases are also observed in the ferroelectric and antiferroelectric rectangular columnar phases, at high and low temperatures, respectively. Switching chiral domains of opposite handedness as well as a change in the sense of chirality within a domain could also be observed for the first time for the ferroelectric phase. Two different switching mechanisms in the ferroelectric and antiferroelectric columnar phases have also been observed. In the presently investigated two series of compounds, the electrooptical switching changes from ferroelectric to antiferroelectric behavior with increasing chain length.	en
dc.format.extent	1166450 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	American Chemical Society	en
dc.relation.uri	http://dx.doi.org/10.1021/cm048684n S0897-4756(04)08684-3	en
dc.rights	2005 American Chemical Society.	en
dc.title	Novel ferroelectric and antiferroelectric smectic and columnar mesophases in fluorinated symmetrical bent-core compounds	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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