Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 44, Issue 3, Pages 2025-2038Publisher
SPRINGER
DOI: 10.1007/s11164-017-3212-0
Keywords
Ionic liquids; Liquid crystals; Pyridinium; Thermal behavior; Nematic phase
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Funding
- Romanian Authority for Scientific Research, CNCS-UEFISCDI [PN-II-ID-PCE-2011-3-0384]
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A series of mono- and di-cationic pyridinium salts with one or two promesogenic cyanobiphenyl groups and different counterions, bromide, dodecylsulfate or dioctyl sulfosuccinate, were designed and prepared while their thermal properties were investigated by means of differential scanning calorimetry (DSC) and thermogravimetric analysis. The monocationic bromide pyridinium salt 3 tethered with only one cyanobiphenyl group behaves as an ionic liquid crystal displaying monotropic nematic and smectic phases at low temperatures, evidenced by polarizing optical microscopy observations and DSC analysis. Replacement of the bromide ion with dodecylsulfate or DOSS- (dioctyl sulfosuccinate) ions gave pyridinium salts with no mesogenic properties. Monocationic pyridinium salt with a DOSS- ion behaves as an ionic liquid with glass transition near - 16 A degrees C.
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