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Boden, Neville, Bushby, Richard J., Cammidge, Andy 
ORCID: https://orcid.org/0000-0001-7912-4310, El-Mansoury, Ahmed, Martin, Philip S. and Lu, Zhibao
(1999)
The creation of persistent glassy columnar discotic liquid crystals using ‘dimeric’ discogens.
Journal of Materials Chemistry, 9 (7).
pp. 1391-1402.
ISSN 0959-9428
Abstract
‘Dimeric’ discogens have been synthesised which have two triphenylene nuclei, each of which bears five β-OC 6 H 13 substituents, which are linked through the remaining β positions by a flexible O(CH 2 ) n O polymethylene chain (n=3-16). Calculations show that the minimum chain length for bridging between columns in the Col h phase of these compounds is O(CH 2 ) 7 O. It was found that only those dimers for which n>7 formed a Col h phase. This mesophase can be supercooled into a metastable glass which is relatively hard and in which the columnar order and orientation is retained. These glasses revert to the crystalline state within a few hours but we have shown that longer-lasting Col h glasses can be engineered through introducing an extra degree of disorder into the glass by making the ‘dimers’ subtly unsymmetrical. These ‘dimers’ either have differently substituted triphenylene rings at the two ends of the linking chain or an amide group within the chain itself. They give Col h aligned glasses which last for months at room temperature.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Chemistry (former - to 2024) |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Photonics and Quantum Science Faculty of Science > Research Groups > Chemistry of Materials and Catalysis Faculty of Science > Research Groups > Chemistry of Light and Energy |
| Depositing User: | LivePure Connector |
| Date Deposited: | 25 Jul 2024 08:30 |
| Last Modified: | 25 Sep 2024 17:57 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/96012 |
| DOI: | 10.1039/A810045D |
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