title: Competition between Cation-Solvent and Cation-Anion Interactions in Imidazolium Ionic Liquids with Polar Aprotic Solvents.
abstract: The subtle interplay between ion solvation and association was analyzed in mixtures of imidazolium-based ionic liquids (ILs) with polar aprotic solvents. A site-specific pattern of cation-solvent and cation-anion interactions was disclosed by a careful analysis of the1H and13C NMR chemical shift dependence of the mixture composition. It was established that the less polar but more donating γ-butyrolactone is more prone to establish H-bonds with the imidazolium-ring hydrogen atoms of the IL cations than propylene carbonate, particularly at the H2site and at high dilutions xIL<0.1. The H2site was found to be more sensitive to intermolecular interactions compared to H4, 5in the case of ILs with asymmetric anions like trifluoromethanesulfonate (TfO-) or bis(trifluoromethylsulfonyl)amide (TFSA-).
authors.affiliation: CERMN, FR CNRS 3038, INC3M, SF 4206 ICORE, Normandie Univ., UNICAEN, Bd Becquerel, 14000, Caen, France.
authors.forename: Bogdan A
authors.initials: BA
authors.lastname: Marekha
authors.affiliation: Department of Inorganic Chemistry, V.N. Karazin Kharkiv National University, Svoboda sq. 4, 61022, Kharkiv, Ukraine.
authors.forename: Oleg N
authors.initials: ON
authors.lastname: Kalugin
authors.affiliation: CCM RMN, University of Lille-Science and Technology, Bât. C4, 59655, Villeneuve d'Ascq, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Bria
authors.affiliation: Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, Honjo-machi, Saga, 840-8502, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takamuku
authors.affiliation: Faculty of Science, Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia.
authors.forename: Slobodan
authors.initials: S
authors.lastname: Gadžurić
authors.affiliation: LASIR (UMR 8516), University of Lille-Science and Technology, Bât. C5, 59655, Villeneuve d'Ascq, France.
authors.forename: Abdenacer
authors.initials: A
authors.lastname: Idrissi
keywords: aprotic solvents; chemical shift; ionic liquids; nuclear magnetic resonance; solvation