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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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Publication details

The article was received on 18 Mar 2002, accepted on 23 Apr 2002 and first published on 11 Jun 2002


Article type: Paper
DOI: 10.1039/B202677E
J. Mater. Chem., 2002,12, 2208-2213

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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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