title: IR and X-ray study of polymorphism in 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides.
abstract: The crystal structure of [C(n)mim]NTf(2) (n = 2, 4, 6) was studied for the first time simultaneously by X-ray diffraction method and IR spectroscopy. The temperature-dependent IR spectrum for crystalline [C(4)mim]NTf(2) was demonstrated to correlate with both the X-ray data and the calorimetric results obtained earlier. Therefore, it was found that IR spectroscopy is able to establish the correspondence between the X-ray and the calorimetric data in this case. The joint use of X-ray diffraction, IR spectroscopy, and quantum-chemical calculations allowed us to determine the structure of all [C(2)mim]NTf(2) crystalline modifications obtained earlier by adiabatic calorimetry measurements. Thus, a new approach for the future identification of ionic liquid crystal structure by use of temperature-dependent infrared spectroscopy is suggested and justified.
authors.affiliation: Chemistry Faculty, Belarusian State University, 220030 Mink, Belarus. paulechka@bsu.by
authors.forename: Y U
authors.initials: YU
authors.lastname: Paulechka
authors.forename: G J
authors.initials: GJ
authors.lastname: Kabo
authors.forename: A V
authors.initials: AV
authors.lastname: Blokhin
authors.forename: A S
authors.initials: AS
authors.lastname: Shaplov
authors.forename: E I
authors.initials: EI
authors.lastname: Lozinskaya
authors.forename: D G
authors.initials: DG
authors.lastname: Golovanov
authors.forename: K A
authors.initials: KA
authors.lastname: Lyssenko
authors.forename: A A
authors.initials: AA
authors.lastname: Korlyukov
authors.forename: Ya S
authors.initials: YS
authors.lastname: Vygodskii