NMR Parameters of Imidazolium Ionic Liquids as Indicators of Their State and Properties in Aqueous Solutions

• Published in: Journal of solution chemistry Vol. 50; no. 1; pp. 90 - 104
• Main Authors: Shahkhatuni, A. A., Shahkhatuni, A. G., Mamyan, S. S., Ananikov, V. P., Harutyunyan, A. S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 2021; Springer Nature B.V
• Subjects: Aqueous solutions; Chemical properties; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Geochemistry; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Ionic liquids; Ions; Moisture content; NMR; Nuclear magnetic resonance; Oceanography; Parameters; Physical Chemistry; Ionic liquids; Aqueous mixtures; Spin–spin coupling constants; Chemical shifts; NMR spectroscopy
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-020-01044-5

Seven 1-methylimidazolium-based ionic liquids (ILs) and their aqueous solutions were systematically investigated in order to explore how the NMR spectroscopic properties (chemical shifts, spin–spin coupling constants) are connected or correlated with several physical and chemical properties (density, viscosity, water content, etc.) of ILs and their aqueous mixtures. 1 H and 13 C NMR chemical shifts of ILs vary markedly depending on different anions, alkyl chain length, and water content. Addition of water affected the NMR parameters in various manners, altering several of them significantly, while others did not change distinctly. Dissimilar behavior of NMR parameters in various solvents at various concentrations allows one to conclude that they reflect several contributions from different properties of ILs and can be used for deep structural investigations.