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Bielawski, Christopher W.
Synthetic Materials & Macromolecules
Research Interests
  • Synthetic chemistry, materials science, polymer chemistry, catalysis, carbon-based materials

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Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties

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Title
Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties
Author
Goossens, KarelRakers, LenaShin, Tae JooHoneker, RomanBielawski, Christopher W.Glorius, Frank
Issue Date
2019-01
Publisher
MDPI
Citation
CRYSTALS, v.9, no.1, pp.34
Abstract
We describe the thermal phase characteristics of a series of 4,5-bis(n-alkyl)azolium salts that were studied using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), polarized-light optical microscopy (POM), and synchrotron-based small- to wide-angle X-ray scattering (SWAXS) measurements. Key results were obtained for 1,3-dimethyl-4,5-bis(n-undecyl)imidazolium iodide (1-11), 1,3-dimethyl-4,5-bis(n-pentadecyl)imidazolium iodide (1-15), and 1,2,3-trimethyl-4,5-bis(n-pentadecyl)imidazolium iodide (2), which were found to adopt enantiotropic smectic A mesophases. Liquid-crystalline mesophases were not observed for 1,3-dimethyl-4,5-bis(n-heptyl)imidazolium iodide (1-7), 3-methyl-4,5-bis(n-pentadecyl)thiazolium iodide (3), and 2-amino-4,5-bis(n-pentadecyl)imidazolium chloride (4). Installing substituents in the 4- and 5-positions of the imidazolium salts appears to increase melting points while lowering clearing points when compared to data reported for 1,3-disubstituted analogues.
URI
https://scholarworks.unist.ac.kr/handle/201301/26447
URL
https://www.mdpi.com/2073-4352/9/1/34
DOI
10.3390/cryst9010034
ISSN
2073-4352
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