Title:	Investigations on photo and electrically switchable asymmetric bent-core liquid crystals
Authors:	Srinivasan, Murugesen Vijay Kannan, Palaninathan Roy, Arun
Issue Date:	Mar-2013
Publisher:	Springer Sciences
Citation:	Journal of Materials Science, 2013, Vol.48, p2433
Abstract:	New series of bent-core liquid crystals (8a–8d) synthesized and their photo and electrical switching properties were investigated. The homologous series of liquid crystals was constructed with five-ring system using structurally non-symmetrical rod-like mesogens connected with 1, 3-phenylene unit. The synthesized precursor and bent-core liquid crystals were characterized by FT-IR, 1H-NMR, and 13C-NMR spectroscopy. The mesophase characterization of the asymmetric bent-core liquid crystals was carried out using polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction studies. The significance of tail length (alkyl chain) and nature of mesogen was explored; shorter alkyl chains bent-core compounds exhibited non-switchable rectangular columnar B1 phase. Whereas longer alkyl chain induces switchable lamellar B2 phase, which was further confirmed by electro-optical methods. This lamellar B2 phase exhibits antiferroelectric–anticlinic organization (SmCAPA) of the molecules in the layers. The photo-switching properties of bent-core azo molecules were investigated using UV–Vis spectroscopy, the trans to cis photoisomerization was observed at 30 s, whereas reverse processes take place in 40 s in chloroform.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/5397
ISSN:	0022-2461 1573-4803- (Online)
Alternative Location:	http://dx.doi.org/10.1007/s10853-012-7030-x
Copyright:	2013 Springer Science
Appears in Collections:	Research Papers (SCM)

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