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Nematogens containing oxyethylene units at a lateral or terminal position and their mixtures with salts

Judeinstein, P and Berdague, P and Bayle, JP and Sinha, Neeraj and Ramanathan, KV (2001) Nematogens containing oxyethylene units at a lateral or terminal position and their mixtures with salts. In: Liquid Crystals, 28 (11). pp. 1691-1698.

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Abstract

Short terminal polyoxyethylene chains may be introduced into mesogens containing lateral substituents such as two hexyloxy chains or a crown-ether fragment. These compounds have a large nematic range near room temperature and can dissolve large amounts of the salt LiBF4 without destroying the nematic arrangment. In the nematic phase, the ions are ordered and the quadrupolar splitting associated with these ions can allow this ordering to be monitored. Increasing the salt concentration does not seem to change the ordering of the individual ions. The $^{13}C$ thermal evolution of the field-induced chemical shift in the oxyethylene (OE) units with or without salt does not show any real difference, indicating that the interaction between the ions and the mesogen is small. This means that there is very little change in conformation in the OE unit when adding salt to the mesogen.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor & Francis.
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly SIF)
Date Deposited: 22 Sep 2008 04:51
Last Modified: 22 Sep 2008 04:51
URI: http://eprints.iisc.ernet.in/id/eprint/15874

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