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A liquid-crystalline silsesquioxane dendrimer exhibiting chiral nematic and columnar mesophases

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JournalChemistry - A European Journal
DatePublished - 2 Jul 2001
Issue number13
Volume7
Number of pages7
Pages (from-to)2758-2764
Original languageEnglish

Abstract

A hexadecamer, first-generation, octasilsesquioxane liquid-crystalline dendrimer was synthesized by a platinum-catalyzed hydrosilylation reaction of the parent first-generation vinyl octasilsesquioxane dendrimer with a modified, laterally substituted mesogen. The structure and purity of the octasilsesquioxane substrate was confirmed by H-1, C-13, and (29) Si NMR spectroscopy, microanalysis, and size exclusion chromatography (SEC). The mesogenic substrate was found to exhibit only a chiral nematic phase, whereas the resulting hexadecamer dendrimer displays enantiotropic chiral nematic, disordered hexagonal columnar, and disordered rectangular columnar phases, with a glass transition below room temperature. The lateral or side-on attachment of the mesogen to the dendritic core was found to be a key design feature in the formation of the mesophases.

    Research areas

  • chiral nematic phases, columnar phases, dendrimers, liquid crystals, silsesquioxane, SIDE-CHAIN POLYMERS, SUPRAMOLECULAR DENDRIMERS, THERMOTROPIC MESOPHASES, CARBOSILANE DENDRIMERS, STILBENOID DENDRIMERS, MESOGENIC GROUPS, GENERATION, DENDROMESOGENS, MACROMOLECULES, DIFFRACTION

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