Volume 29, Issue 24 e202203604
Research Article

Columnar Liquid Crystalline Glasses by Combining Configurational Flexibility with Moderate Deviation from Planarity: Extended Triaryltriazines

Fabrícia Nunes da Silva

Fabrícia Nunes da Silva

Departamento de Química, Universidade Federal da Bahia, Ondina, 40170-115 Salvador, BA, Brazil

Centre de Recherche Paul Pascal, Université Bordeaux, 115 av. Schweitzer, 33600 Pessac, France

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Hugo Marchi Luciano

Hugo Marchi Luciano

Centre de Recherche Paul Pascal, Université Bordeaux, 115 av. Schweitzer, 33600 Pessac, France

Departamento de Química, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Carlos H. Stadtlober

Carlos H. Stadtlober

Departamento de Física, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Dr. Giliandro Farias

Dr. Giliandro Farias

Departamento de Química, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Dr. Fabien Durola

Dr. Fabien Durola

Centre de Recherche Paul Pascal, CNRS, 115 av. Schweitzer, 33600 Pessac, France

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Prof. Juliana Eccher

Prof. Juliana Eccher

Departamento de Física, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Prof. Ivan H. Bechtold

Corresponding Author

Prof. Ivan H. Bechtold

Departamento de Física, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Dr. Harald Bock

Corresponding Author

Dr. Harald Bock

Centre de Recherche Paul Pascal, CNRS, 115 av. Schweitzer, 33600 Pessac, France

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Prof. Hugo Gallardo

Prof. Hugo Gallardo

Departamento de Química, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil

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Prof. André A. Vieira

Corresponding Author

Prof. André A. Vieira

Departamento de Química, Universidade Federal da Bahia, Ondina, 40170-115 Salvador, BA, Brazil

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First published: 24 January 2023
Citations: 2

Graphical Abstract

Three curved aryl arms attached by rotation-allowing single bonds to a triazine core, together with only short alkyl chains, lead to a glass transition that yields a solid alignable hexagonal columnar mesophase at room temperature.

Abstract

Triply phenanthryl- and tetrahelicenyl-substituted triazine-hexaalkyl esters with short alkyl chains show glass transitions conveniently above room temperature within the hexagonal columnar liquid crystalline state, resulting in a solid columnar order at room temperature. As the hexagonal columnar mesophase is easily aligned with the director perpendicular to a solid substrate, such glassy columnar liquid matrices are aimed at for the orientation of guest emitters, to obtain anisotropic emission. A condition for face-on alignment on substrates are attainable melting and clearing temperatures, which is achieved with the moderately nonplanar tetrahelicenyl derivatives in spite of their short alkyl periphery. An unusual phase transition between two columnar mesophases of same hexagonal symmetry, but very different long-distance regularity of the column lattice, is found in one phenanthryl homolog.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.