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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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Official URL: http://dx.doi.org/10.1016/j.molliq.2018.09.120


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
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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