Mesophase stabilization in ionic liquid crystals through pairing equally shaped mesogenic cations and anions

Stappert, Kathrin; Lipinski, Gregor; Kopiec, Gabriel; Spielberg, Eike T.; Mudring, Anja -Verena

doi:10.1021/acs.cgd.5b01023

Title: Mesophase stabilization in ionic liquid crystals through pairing equally shaped mesogenic cations and anions

Journal Article · Thu Jul 23 00:00:00 EDT 2015 · Crystal Growth and Design

DOI:https://doi.org/10.1021/acs.cgd.5b01023· OSTI ID:1239155

Stappert, Kathrin ^[1]; Lipinski, Gregor ^[1]; Kopiec, Gabriel ^[2]; Spielberg, Eike T. ^[3]; Mudring, Anja -Verena ^[2]

Ruhr-Univ. Bochum, Bochum (Germany)
Ruhr-Univ. Bochum, Bochum (Germany); Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Ruhr-Univ. Bochum, Bochum (Germany); Univ. Duisburg Essen, Essen (Germany)

The synthesis and properties of a set of novel ionic liquid crystals with congruently shaped cations and anions are reported to check whether pairing mesogenic cations with mesogenic anions leads to a stabilization of a liquid crystalline phase. To that avail 1-alkyl-3-methyl-triazolium cations with an alkyl chain length of 10, 12, and 14 carbon atoms have been combined with p-alkyloxy-benzenesulfonate anions with different alkyl chain lengths (n = 10, 12, and 14). The corresponding triazolium iodides have been synthesized as reference compounds where the cation and anion have strong size and shape mismatch. The mesomorphic behavior of all compounds is studied by differential scanning calorimetry and polarizing optical microscopy. All compounds except 1-methyl-3-decyltriazolium iodide, which qualifies as an ionic liquid, are thermotropic ionic liquid crystals. All other compounds adopt smectic A phases. As a result, a comparison of the thermal phase behavior of the 1-methyl-3-decyltriazolium bromides to the corresponding p-alkoxy-benzensulfonates reveals that definitely the mesophase is stabilized by pairing the rod-shaped 1-alkyl-3-methyltriazolium cation with a rod-like anion of similar size.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1239155

Report Number(s):: IS-J-8856

Journal Information:: Crystal Growth and Design, Vol. 15, Issue 11; ISSN 1528-7483

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 9 works

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Web of Science

References (23)

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Cited By (2)

1,2,4-Triazolium ions as flexible scaffolds for the construction of polyphilic ionic liquid crystals Riccobono, Alessio; Parker, Rachel R.; Whitwood, Adrian C. Chemical Communications, Vol. 54, Issue 71 https://doi.org/10.1039/c8cc04704a	journal	January 2018
Synthesis, structural characterization and luminescence properties of 1-carboxymethyl-3-ethylimidazolium chloride Prodius, Denis; Wilk-Kozubek, Magdalena; Mudring, Anja-Verena Acta Crystallographica Section C Structural Chemistry, Vol. 74, Issue 6 https://doi.org/10.1107/s2053229618005272	journal	May 2018

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