Jump to main content
Jump to site search

Issue 8, 2002
Previous Article Next Article

Columnar mesophase from a new hybrid siloxane-triphenylene

Author affiliations


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 (ColRp2gg) mesophase between 55 and 88 °C for the former, and a broad hexagonal (ColHp6mm) 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

Back to tab navigation

Article information

18 Mar 2002
23 Apr 2002
First published
11 Jun 2002

J. Mater. Chem., 2002,12, 2208-2213
Article type

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

Search articles by author