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Updated: Mar 9, 2026
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Microscopic solvation environments in a prototype room-temperature ionic liquid as elucidated by resonance Raman
Satyen Saha1, Hajime Okajima2, Osamu Homma3
1Department of Chemistry, Centre for Advanced Studies, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
Abstract:
Microscopic solvation environments in a prototype ionic liquid, bmimTf2N; 1-butyl-3-methyl-imidazolium-bis(trifluoromethanesulfonyl)imide, have been studied with the use of halides, X2 and Xn- (X=I, Br; n=3,5), as molecular probes. Resonance Raman spectroscopy has been used to detect these halogen species existing in bmimTf2N as well as in reference solvents including heptane, cyclohexane, KX/H2O and benzene. In heptane and cyclohexane, only free X2 species are detected. In KX/H2O, only Xn- and, in benzene, only benzene-X2 complexes are detected. On the contrary, free X2 and Xn- are concomitantly detected in bmimTf2N, indicating that there are two distinct solvation environments in bmimTf2N, non-polar environments that solvate free X2 and polar environments that stabilize Xn-. These two distinct solvation environments are most likely to arise from microscopic structural heterogeneity of ionic liquids.
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