Novel electron-deficient phenanthridine based discotic liquid crystals

Yuvaraj, AR and Renjith, Anu and Kumar, Sandeep (2018) Novel electron-deficient phenanthridine based discotic liquid crystals. In: JOURNAL OF MOLECULAR LIQUIDS, 272 . pp. 583-589.

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Abstract

Nitrogen-containing polycyclic core 5-phenylnaphtho1,2,3,4-lmn] phenanthridine and its nitro-functionalized positional isomers were synthesized using Pictet-Spengler reaction between hexaalkoxytriphenylene-1-amine and various aryl aldehydes. The hexagonal columnar phase was observed in all the synthesized novel compounds. Mesomorphic characterization was carried out using conventional thermal analysis and X-ray diffraction techniques. These compounds showed room temperature liquid crystal phase and there is no crystalline phase observed even at -20 degrees C upon cooling from the isotropic temperature. Further, the long range of mesophase was confirmed by polarizing optical microscopy. Subsequently, charge transfer complexes were prepared by mixing the synthesized polycyclic hetero-aromatic compounds with 2,3,6,7,10,11-hexakis(octyloxy)-triphenylene. In UV-Vis absorption spectra, a redshift was found for the charge transfer complexes; which confirmed the interaction between donor-acceptor counterparts. The electrical conductivity of the charge transfer complexes and their pure target compounds was measured. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF MOLECULAR LIQUIDS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright for this article belongs to Elsevier Science.
Keywords:	Discotic liquid crystals; Pictet-Spengler; Hetero-polycyclic; Mesophase; Conductivity
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	31 Dec 2018 10:54
Last Modified:	31 Dec 2018 10:54
URI:	http://eprints.iisc.ac.in/id/eprint/61281

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