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Nematogens with more flexible chains than aromatic rings in the core

Berdague, P and Munier, M and Judeinstein, P and Bayle, JP and Nagaraja, CS and Ramanathan, KV (1999) Nematogens with more flexible chains than aromatic rings in the core. In: Liquid Crystals, 26 (2). pp. 211-218.

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0267829...


Mesogens containing four rings in the main core can accommodate one terminal and two nearby lateral chains on each outside aromatic ring. These compounds containing six chains present an enantiotropic nematic range which is influenced by the rigidity of the links. The conformational behaviour of the first methyleneoxy group within the chains was investigated by one and two dimensional C-13 NMR. The sign of the jump in chemical shifts when entering the nematic phase indicates the folding of each lateral branch. Dipolar oscillations during cross-polarization contact provide the values of the bond order parameter. The two First lateral fragments do not behave in the same way, demonstrating the influence of the fragment along which the chain is back: folded.

Item Type: Journal Article
Publication: Liquid Crystals
Publisher: Taylor and Francis Group
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Department/Centre: Division of Chemical Sciences > Sophisticated Instruments Facility (Continued as NMR Research Centre)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 30 Jun 2011 09:18
Last Modified: 30 Jun 2011 09:18
URI: http://eprints.iisc.ac.in/id/eprint/38687

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