Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties
AbstractWe 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. View Full-Text
- Supplementary File 1:
PDF-Document (PDF, 604 KB)
A printed edition of this Special Issue is available here.
Share & Cite This Article
Goossens, K.; Rakers, L.; Shin, T.J.; Honeker, R.; Bielawski, C.W.; Glorius, F. Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties. Crystals 2019, 9, 34.
Goossens K, Rakers L, Shin TJ, Honeker R, Bielawski CW, Glorius F. Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties. Crystals. 2019; 9(1):34.Chicago/Turabian Style
Goossens, Karel; Rakers, Lena; Shin, Tae J.; Honeker, Roman; Bielawski, Christopher W.; Glorius, Frank. 2019. "Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties." Crystals 9, no. 1: 34.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.