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Updated: May 21, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Inclusion complex formation of ionic liquids with cucurbit[7]uril studied by competitive binding of methylene blue
Shuya Cui1, Junliang Du, Tao Wang
1College of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, PR China.
Abstract:
Methylene blue (MB) was used as a fluorescent probe to study the encapsulation of three kinds of 1-butyl-3-methylimidazolium ionic liquids in cucurbit[7]uril (CB7) at pH 3. Addition of ionic liquids to the aqueous solution of MB-CB7 inclusion complexes brought about considerable fluorescence intensity quenching, and it was because that MB was extruded from the cavity of CB7 into the aqueous phase by the ionic liquid. NMR and AM1 semi-empirical calculations indicated that the 1-butyl-imidazolium moiety of ionic liquid was responsible for the complexation with CB7.
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