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Volume 12
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10.3390/cryst12050715
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Article

Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones

by
Isabela Dumitru
1,
Florentina L. Chiriac
1,
Monica Ilis
1,
Iuliana Pasuk
2,
Doina Manaila-Maximean
3,
Marin Micutz
4,
Teodora Staicu
4 and
Viorel Cîrcu
1,*
1
Department of Inorganic Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd., 030018 Bucharest, Romania
2
National Institute of Materials Physics, P.O. Box MG-7, 077125 Magurele, Romania
3
Department of Physics, University Politehnica of Bucharest, Spl. Independentei 313, 060042 Bucharest, Romania
4
Department of Physical Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd., 030018 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Crystals 2022, 12(5), 715; https://doi.org/10.3390/cryst12050715
Submission received: 8 April 2022 / Revised: 12 May 2022 / Accepted: 13 May 2022 / Published: 17 May 2022
(This article belongs to the Special Issue Liquid Crystal Composites)
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Abstract

The synthesis and characterization of novel ionic liquid crystals based on pyridinium salts with Br− and PF6− counterions are described in this work. These pyridinium salts were derived from 4-hydroxypyridine, both by N- and O-alkylation. The 3,4,5-tri(alkyloxy)-benzyl mesogenic unit was attached to the nitrogen atom of the pyridinium ring. Alkyl chains with a different number of carbon atoms (6, 8, 10, 12 and 14) were employed in order to show the effect on the stability of mesophase. The POM (polarizing optical microscopy) and XRD (powder X-ray diffraction) studies indicated that bromide salts with shorter chains C6, C8 and C10 do not show mesomorphic properties, while longer chain analogues with C12 and C14 exhibit two enantiotropic columnar phases. Surprisingly, the pyridinium salts with the larger size PF6− counterion do not exhibit liquid crystal properties.
Keywords: liquid crystals; ionic liquid crystals; pyridinium salts; 4-pyridone; columnar phase liquid crystals; ionic liquid crystals; pyridinium salts; 4-pyridone; columnar phase

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MDPI and ACS Style

Dumitru, I.; Chiriac, F.L.; Ilis, M.; Pasuk, I.; Manaila-Maximean, D.; Micutz, M.; Staicu, T.; Cîrcu, V. Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones. Crystals 2022, 12, 715. https://doi.org/10.3390/cryst12050715

AMA Style

Dumitru I, Chiriac FL, Ilis M, Pasuk I, Manaila-Maximean D, Micutz M, Staicu T, Cîrcu V. Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones. Crystals. 2022; 12(5):715. https://doi.org/10.3390/cryst12050715

Chicago/Turabian Style

Dumitru, Isabela, Florentina L. Chiriac, Monica Ilis, Iuliana Pasuk, Doina Manaila-Maximean, Marin Micutz, Teodora Staicu, and Viorel Cîrcu. 2022. "Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones" Crystals 12, no. 5: 715. https://doi.org/10.3390/cryst12050715

APA Style

Dumitru, I., Chiriac, F. L., Ilis, M., Pasuk, I., Manaila-Maximean, D., Micutz, M., Staicu, T., & Cîrcu, V. (2022). Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones. Crystals, 12(5), 715. https://doi.org/10.3390/cryst12050715

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