Dissymmetric Triaryltriazines: Small Mass Columnar Glasses - Archive ouverte HAL Access content directly
Journal Articles Chemistry - A European Journal Year : 2023

Dissymmetric Triaryltriazines: Small Mass Columnar Glasses

Carlos Stadtlober
  • Function : Author
Giliandro Farias
Fabien Durola
Harald Bock
Hugo Gallardo
André Vieira

Abstract

Abstract Columnar liquid crystals with very small molecular masses that form anisotropic glasses well above room temperature are obtained by mixed dissymmetric substitution of sym ‐triazine with ester‐bearing phenyl and phenanthryl or tetrahelicenyl moieties. The combination of low molecular symmetry with configurational flexibility and short polar ester moieties stabilizes the mesophase over large temperature ranges and induces pronounced calorimetric glass transitions within the anisotropic fluid despite the smallness of the molecules. In contrast to more symmetrical homologs, no ester tails longer than ethyl are necessary to induce the liquid crystalline state, allowing for the near‐absence of any insulating and weight‐increasing alkyl periphery. Films drop‐cast from solution show in all cases emission spectra that do not show significant change of fluorescence emission upon annealing, indicating that the columnar hexagonal mesoscopic order is obtained directly upon deposition from solution and is resistant to crystallization upon annealing.
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Dates and versions

hal-04238980 , version 1 (12-10-2023)

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Fabrícia Nunes da Silva, Hugo Marchi Luciano, Carlos Stadtlober, Giliandro Farias, Fabien Durola, et al.. Dissymmetric Triaryltriazines: Small Mass Columnar Glasses. Chemistry - A European Journal, 2023, 29 (46), ⟨10.1002/chem.202301319⟩. ⟨hal-04238980⟩

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