Studies on some smectogenic compounds with large bilayer spacings

Madhusudana, N.V.; Srikanta, B.S.; Urs, Subramanya Raj M.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2515

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DC Field	Value	Language
dc.contributor.author	Madhusudana, N.V.	-
dc.contributor.author	Srikanta, B.S.	-
dc.contributor.author	Urs, Subramanya Raj M.	-
dc.date.accessioned	2007-05-28T11:15:22Z	-
dc.date.available	2007-05-28T11:15:22Z	-
dc.date.issued	1983-07	-
dc.identifier.citation	Molecular Crystals and Liquid Crystals, 1983, Vol.97, p49-75	en
dc.identifier.issn	1058-725X	-
dc.identifier.uri	http://hdl.handle.net/2289/2515	-
dc.description	Restricted Access. Paper presented at the 9th international conference on liquid crystals held at Bangalore in 1982.	en
dc.description.abstract	In mesomorphic compounds with strongly polar end groups, near neighbor molecules have antiparallel correlations. This results in a bilayer structure which in turn leads to several interesting phenomena like reentrance and smectic polymorphism. After a brief review of the development of this subject, we report some unusual properties in several compounds with relatively large bilayer spacings (ge 1.6 times the molecular length). For example, 4-n-decylphenyl-3'-methyl-4'-(4"-nitrobenzoyloxy)benzoate (10 PMNBB) shows a remarkably large expansion (~20%) of the bilayer spacing on cooling in the SA phase, the rate of expansion increasing with decrease of temperature. Further, the dielectric anisotropy reverses sign, becoming negative at lower temperatures. When the nitro group is replaced by a cyano group (10 PMCBB), (a) the rate of expansion of the bilayer spacing decreases with decrease of temperature, and (b) an SA - SA transition takes place with a jump of ~0.4 Å in the layer spacing at TAN - T sime 15°. We present results on several homologues of both the compounds as also on compounds with a lateral methoxy substituent.	en
dc.format.extent	673818 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Gordon and Breach Science Publishers.	en
dc.relation.uri	http://dx.doi.org/10.1080/00268948308073140	en
dc.rights	1983 OPA (Overseas Publishers Association) N.V.	en
dc.title	Studies on some smectogenic compounds with large bilayer spacings	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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