Study on inclusion complexation of β-CD and nitro-benzyl-imidazolium-based ionic liquids with various physicochemical techniques

Research on host-guest chemistry enhances the bioavailability of the guest molecules by 'remediation processes. For that purpose, evaluating the physicochemical properties of inclusion complexes (ICs, e.g. beta-cyclodextrin as host and an ionic liquid as a guest) is necessary and of value for research in green chemistry. In this work, series of the novel nitro substituted imidazolium-based positional (ortho, meta, para) isomeric ionic liquids (ILs) have been synthesized, and their ICs with beta-CD, characterized by (H-1 NMR, NMR titration, 2D-ROESY, FT-IR) spectroscopic techniques. Conductivity measurements were carried out to understand the mobility of the ions in these complexes, and SEM was used to describe their morphological changes. Further, the structural and positional effect on properties was examined using UV-Vis, PXRD, DSC, and controlled release with the help of thermogravimetric analysis. Furthermore, the potential application of ICs is explored for the desulfurization of model fuel consisting of dibenzothiophene. The findings of this work provide the proof of concept that studied nitro substituted imidazolium-based ILs-beta-CD host-guest complexes should act as a potential candidate for desulfurization of fuel. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Research on host-guest chemistry enhances the bioavailability of guest molecules through remediation processes. This study synthesized a series of novel nitro-substituted imidazolium-based ionic liquids and investigated their inclusion complexes with β-cyclodextrin, as well as their potential application in fuel desulfurization.