Control of the Discotic to Isotropic Transition in Alkoxy-Substituted Silicondihydroxo-Phthalocyanines by Axial Substituents
- 1 January 1988
- journal article
- research article
- Published by Informa UK Limited in Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics
- Vol. 162 (2), 97-118
- https://doi.org/10.1080/00268948808084451
Abstract
The synthesis of a homologous series of octaalkoxy-substituted silicondihydroxo-phthalocyanines is described. The mesomorphic properties of these new materials were studied by DSC, optical microscopy and X-ray investigations. Compounds with n ≤ 4 (n is the number of carbon atoms in a single alkoxy side chain) show a discotic mesophase transition. A transition to the isotropic state is only observed when n ≤ 8. X-ray diffraction patterns of the mesophases confirm that all compounds form a hexagonal columnar mesophase of the type Dhd.Keywords
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