The synthesis and thermotropic behaviour of some di-alkyloxy-phenyl-1,2,4-triazolium trifluoromethane-sulfonate salts bearing a seven-carbon atom perfluoroalkyl chain on the cation is herein described. The fluorinated salts presenting a 1,2,4-triazole as a core and differing in the length of two alkyloxy chains on the phenyl ring demonstrated a typical liquid crystalline behaviour. The mesomorphic properties of this set of salts were studied by differential scanning calorimetry and polarized optical microscopy. The thermotropic properties are discussed on the grounds of the tuneable structures of the salts. The results showed the existence of a monotropic, columnar, liquid crystalline phase for the salts tested. An increase in the temperature mesophase range and the presence of two enantiotropic mesophases for the sixteen-atom alkyloxy chain salt can be observed by increasing the length of the alkyloxy chain on the phenyl ring.

Rizzo C., Fiduccia I., Buscemi S., Palumbo Piccionello A., Pace A., Pibiri I. (2023). Shaping 1,2,4-Triazolium Fluorinated Ionic Liquid Crystals. APPLIED SCIENCES, 13(5), 1-12 [10.3390/app13052947].

Shaping 1,2,4-Triazolium Fluorinated Ionic Liquid Crystals

Rizzo C.
Primo
Writing – Original Draft Preparation
;
Fiduccia I.
Secondo
Formal Analysis
;
Buscemi S.
Visualization
;
Palumbo Piccionello A.
Investigation
;
Pace A.
Penultimo
Writing – Review & Editing
;
Pibiri I.
Ultimo
Conceptualization
2023-02-24

Abstract

The synthesis and thermotropic behaviour of some di-alkyloxy-phenyl-1,2,4-triazolium trifluoromethane-sulfonate salts bearing a seven-carbon atom perfluoroalkyl chain on the cation is herein described. The fluorinated salts presenting a 1,2,4-triazole as a core and differing in the length of two alkyloxy chains on the phenyl ring demonstrated a typical liquid crystalline behaviour. The mesomorphic properties of this set of salts were studied by differential scanning calorimetry and polarized optical microscopy. The thermotropic properties are discussed on the grounds of the tuneable structures of the salts. The results showed the existence of a monotropic, columnar, liquid crystalline phase for the salts tested. An increase in the temperature mesophase range and the presence of two enantiotropic mesophases for the sixteen-atom alkyloxy chain salt can be observed by increasing the length of the alkyloxy chain on the phenyl ring.
24-feb-2023
Settore CHIM/06 - Chimica Organica
Rizzo C., Fiduccia I., Buscemi S., Palumbo Piccionello A., Pace A., Pibiri I. (2023). Shaping 1,2,4-Triazolium Fluorinated Ionic Liquid Crystals. APPLIED SCIENCES, 13(5), 1-12 [10.3390/app13052947].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/589432
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