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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals Volume 364, 2001 - Issue 1
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Original Articles

Mesomorphic Properties and Hydrogen Bonding Formation of Asymmetrical Triphenylene Discotic Liquid Crystals

Wen Wan Department of Organic Materials, Osaka National Research Institute, AIST-MITI, Midorigaoka 1-8-31, Ikeda, Osaka, 563-857, JAPAN
,
Hirosato Monobe Department of Organic Materials, Osaka National Research Institute, AIST-MITI, Midorigaoka 1-8-31, Ikeda, Osaka, 563-857, JAPAN
,
Takushi Sugino Department of Organic Materials, Osaka National Research Institute, AIST-MITI, Midorigaoka 1-8-31, Ikeda, Osaka, 563-857, JAPAN
,
Yuko Tanaka Department of Organic Materials, Osaka National Research Institute, AIST-MITI, Midorigaoka 1-8-31, Ikeda, Osaka, 563-857, JAPAN
&
Yo Shimizu Department of Organic Materials, Osaka National Research Institute, AIST-MITI, Midorigaoka 1-8-31, Ikeda, Osaka, 563-857, JAPAN
Pages 597-603 | Published online: 24 Sep 2006
 
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Abstract

Asymmetrical triphenylene derivatives containing ester or carboxylic acids as terminal substituents were synthesized and characterized by DSC, optical microscopy and X-ray diffraction. It was found that in the ester homologues, only one compound exhibits a monotropic nematic (ND) mesophase, while most of the carboxylic acid derivatives show a hexagonal columnar (Colh) mesophase. Temperature dependent infrared spectra of the carboxylic acid derivatives indicate the existence of strong hydrogen bonding interactions in the isotropic, mesomorphic and solid phases.

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Related Research Data

Triphenylene‐based discotic liquid crystal dimers, oligomers and polymers
Source: Informa UK Limited
Influence of peripheral alkyl chain length on the mesomorphic behaviours of hexasubstituted triphenylene 2,3-dicarboxylic esters
Source: Informa UK Limited
Supramolecular organogels based on mesogenic 2,7-difunctionalized triphenylenes as a simple system for water content assessment in light alcohols
Source: Royal Society of Chemistry (RSC)

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