6533b822fe1ef96bd127d9a0
RESEARCH PRODUCT
Oxadiazolyl-Pyridinium as Cationic Scaffold for Fluorinated Ionic Liquid Crystals
Antonio Palumbo-piccionelloAndrea PaceMelina S. WeberGiuseppe LazzaraIvana PibiriMargit Schulzesubject
TechnologyQH301-705.5QC1-999heterocyclicThermotropic crystalSettore CHIM/12 - Chimica Dell'Ambiente E Dei Beni Culturaliionic liquidsfluorinated saltsmesogenschemistry.chemical_compoundliquid crystalsLiquid crystalBromidePolymer chemistryMoietyGeneral Materials ScienceBiology (General)QD1-999InstrumentationAlkylFluid Flow and Transfer Processeschemistry.chemical_classificationTPhysicsProcess Chemistry and TechnologyGeneral EngineeringCationic polymerizationSettore CHIM/06 - Chimica OrganicaEngineering (General). Civil engineering (General)Computer Science ApplicationsChemistrychemistryddc:540Ionic liquidPyridiniumTA1-2040description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-11-03 | Applied Sciences |