New Luminescent Liquid Crystals Based on 2,1,3-Benzothiadiazole and Bent Five-membered N-Heterocyclic Cores

New fluorescent liquid crystalline (LC) compounds containing the 2,1,3-benzothiadiazole chromophore as the central core substituted with 1,2,4-oxadiazole, 1,2,3-triazole and 1,2-isoxazole heterocycles were synthesised and their mesophases characterised by polarised optical microscopy, differential s...

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Published inLiquid crystals Vol. 39; no. 9; pp. 1099 - 1111
Main Authors Gallardo, Hugo, Conte, Gilmar, Tuzimoto, Patricia A., Behramand, B., Molin, Fernando, Eccher, Juliana, Bechtold, Ivan H.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 01.09.2012
Taylor & Francis Ltd
Subjects
2,1,3-benzothiadiazole
Chemical compounds
Chromophores
Differential scanning calorimetry
Diffraction
Liquid crystal polymers
Liquid crystals
luminescent materials
Mesophase
Phases
Sonogashira coupling
Thermal stability
X-rays
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Summary:New fluorescent liquid crystalline (LC) compounds containing the 2,1,3-benzothiadiazole chromophore as the central core substituted with 1,2,4-oxadiazole, 1,2,3-triazole and 1,2-isoxazole heterocycles were synthesised and their mesophases characterised by polarised optical microscopy, differential scanning calorimetry and X-ray diffraction. We observed that the bent angles of the five-membered heterocyclic substituents are crucial in determining the thermal stability of the LC phases formed, indicating a delicate balance of forces involved in LC phases. The mesophases formed by all symmetrical and unsymmetrical compounds showed thermal stability in the order 1,2-isoxazole > 1,2,3-triazole > 1,2,4-oxadiazole.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2012.698313