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

Goossens, Karel; Rakers, Lena; Shin, Tae Joo; Honeker, Roman; Bielawski, Christopher W.; Glorius, Frank

doi:10.3390/cryst9010034

[해외논문] Substituted Azolium Disposition: Examining the Effects of Alkyl Placement on Thermal Properties 원문보기

Crystals, v.9 no.1, 2019년, pp.34 -

Goossens, Karel (Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Korea) , Rakers, Lena (Organisch-Chemisches Institut, Westfä) , Shin, Tae Joo (lische Wilhelms-Universitä) , Honeker, Roman (t Mü) , Bielawski, Christopher W. (nster, Corrensstraße 40, 48149 Mü) , Glorius, Frank (nster, Germany)

Abstract ▼ AI-Helper

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.

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