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Issue 8, 2002
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Columnar mesophase from a new hybrid siloxane-triphenylene

Rachid Zniber,a   Redouane Achour,a   Mohammed Zoubaïr Cherkaoui ,†a   Bertrand Donnio,b   Lionel Gehringerb  and  Daniel Guillon*b  
Author affiliations

* Corresponding authors

a Université Mohammed V, Faculté des Sciences, Laboratoire de Chimie Organique Hétérocyclique, Avenue Ibn Batouta, Rabat, Morocco

b Institut de Physique et Chimie des Matériaux de Strasbourg, Groupe des Matériaux Organiques (CNRS-ULP, UMR 7504), 23 rue du Loess, BP 20CR, Strasbourg Cedex, France
E-mail: daniel.guillon@ipcms.u-strasbg.fr
Fax: + 33388107246

Abstract

The design, the synthesis and the mesomorphic properties of a new disc-like mesogen based on a hexasubstituted triphenylene core terminated with pentamethyldisiloxane pendant groups are reported. The siloxane fragments were grafted to the six terminal olefinic branches of a triphenylene precursor by a Pt-catalysed hydrosilylation reaction. Both the hexaolefinic and the hexasiloxane derivatives are mesomorphic, showing a rectangular columnar (ColR—p2gg) mesophase between 55 and 88 °C for the former, and a broad hexagonal (ColH—p6mm) mesophase between ambient temperature and 125 °C for the latter. The liquid crystalline behaviour was investigated by means of differential scanning calorimetry, polarised-light optical microscopy, and X-ray diffractometry. The mesophase temperature range and stability were considerably extended for the hybrid compound with respect to the siloxane-free compound. This behaviour is explained on the basis of enhanced microsegregation between the chemically distinct constituent components of the molecule.

Graphical abstract: Columnar mesophase from a new hybrid siloxane-triphenylene

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Article information

https://doi.org/10.1039/B202677E
Submitted
18 Mar 2002
Accepted
23 Apr 2002
First published
11 Jun 2002
J. Mater. Chem., 2002,12, 2208-2213
Article type
Paper
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Columnar mesophase from a new hybrid siloxane-triphenylene

R. Zniber, R. Achour, M. Z. Cherkaoui , B. Donnio, L. Gehringer and D. Guillon, J. Mater. Chem., 2002, 12, 2208
DOI: 10.1039/B202677E

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