Title:	Synthesis and characterisation of novel isoxazole-based banana liquid crystals from naturally occurring curcumin
Authors:	Gowda, Ashwathanarayana Roy, Arun Kumar, Sandeep
Issue Date:	30-Sep-2015
Publisher:	Taylor & Francis
Citation:	Liquid Crystals, 2016, Vol. 43, p 175-182
Abstract:	Isoxazole-based bent-core liquid crystals (LCs) derived from naturally occurring curcumin were synthesised and their LC properties were investigated by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction techniques. Five compounds, including a branched alkyl chain derivative, were prepared and characterised. These derivatives exhibit enantiotropic mesophases. While lower homologues display wide-temperature-range nematic phase, a longer-chain derivative 3d shows smectic C phase in addition to the nematic phase. The bent angle in these compounds is in between calamitic LCs and banana LCs. Therefore, the molecules escape from polar order packing observed in typical bent-core LCs. Increasing the length of alkyl chain reduces both melting and isotropic temperatures in the series. However, the compound with branched alkyl chains exhibits significant reduction in the nematic-isotropic temperature only. Detailed XRD experiments confirm the presence of the N phase in the lower homologues and SmC phase in a higher homologue.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/6378
ISSN:	0267-8292 1366-5855 (online)
Alternative Location:	http://dx.doi.org/10.1080/02678292.2015.1085103
Copyright:	2015 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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