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Karel Goossens
다차원 탄소재료 연구단
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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(s)
Karel Goossens; Lena Rakers; Tae Joo Shin; Roman Honeker; Christopher W. Bielawski; Frank Glorius
Publication Date
2019-01
Journal
CRYSTALS, v.9, no.1, pp.34 -
Publisher
MDPI
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. © 2019 by the authors.
URI
https://pr.ibs.re.kr/handle/8788114/5739
ISSN
2073-4352
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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