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Oxadiazolyl-Pyridinium as Cationic Scaffold for Fluorinated Ionic Liquid Crystals

  • The synthesis and characterization of a new class of 1,2,4-oxadiazolylpyridinium as a cationic scaffold for fluorinated ionic liquid crystals is herein described. A series of 12 fluorinated heterocyclic salts based on a 1,2,4-oxadiazole moiety, connected through its C(5) or C(3) to an N-alkylpyridinium unit and a perfluoroheptyl chain, differing in the length of the alkyl chain and counterions, has been synthesized. As counterions iodide, bromide and bis(trifluoromethane)sulfonimide have been considered. The synthesis, structure, and liquid crystalline properties of these compounds are discussed on the basis of the tuned structural variables. The thermotropic properties of this series of salts have been investigated by differential scanning calorimetry and polarized optical microscopy. The results showed the existence of an enantiotropic mesomorphic smectic liquid crystalline phase for six bis(trifluoromethane)sulfonimide salts.

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Metadaten
Document Type:Article
Language:English
Author:Melina S. Weber, Margit Schulze, Giuseppe Lazzara, Antonio Palumbo Piccionello, Andrea Pace, Ivana Pibiri
Parent Title (English):Applied Sciences
Volume:11
Issue:21
Pagenumber:12
First Page:10347
ISSN:2076-3417
URN:urn:nbn:de:hbz:1044-opus-59886
DOI:https://doi.org/10.3390/app112110347
Publisher:MDPI
Place of publication:Basel
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2021/11/03
Note:
This work is dedicated to the memory of Prof. Sergio Rosselli.
Keyword:Ionic liquids; fluorinated salts; heterocyclic; liquid crystals; mesogens
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Entry in this database:2021/11/11
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International