Synthesis and characterization of the inclusion complex of dicationic ionic liquid and β-cyclodextrin.

Puvaneswary Subramaniam,Yatimah Alias,Sharifah Mohamad

doi:10.3390/ijms11103675

Puvaneswary Subramaniam, Yatimah Alias + Show 1 more

Open Access

https://doi.org/10.3390/ijms11103675

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Abstract

The supramolecular structure of the inclusion complex of β-cyclodextrin (β-CD) with 1,1′,2,2′-tetramethyl-3,3′-(p-phenylenedimethylene) diimidazolium dibromide (TetraPhimBr), a dicationic ionic liquid, has been investigated. The inclusion complex with 1:1 molar ratio was prepared by a kneading method. Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD) analysis, 1H NMR and thermogravimetric analysis (TGA) confirmed the formation of the inclusion complex. The results showed that the host-guest system is a fine crystalline powder. The decomposition temperature of the inclusion complex is lower than that of its parent molecules, TetraPhimBr and β-CD individually.

Highlights

Inclusion complexes (ICs), those leading to supramolecular self-assemblies, have been attracting much attention as they serve as models for understanding molecular recognition and as precursors for designing novel nanomaterials for electronics and biological applications [1,2,3,4]
The formation of the inclusion complex of β-CD-TetraPhimBr was confirmed by various physico-chemical techniques including fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), 1H NMR spectroscopy and thermogravimetric analysis (TGA)
The results suggest that the inclusion complex obtained is a fine crystalline powder and the XRD pattern of the β-CD-TetraPhimBr shows that the inclusion complex forms head-to-head channels [23]

Summary

Introduction

Inclusion complexes (ICs), those leading to supramolecular self-assemblies, have been attracting much attention as they serve as models for understanding molecular recognition and as precursors for designing novel nanomaterials for electronics and biological applications [1,2,3,4]. Ionic liquids (ILs), which consist of organic cations and appropriate anions, have increased interest due to their high ionic conductivity, excellent chemical stability, nonflammability and negligible volatility [8,9]. As they promise significant environmental benefits, ILs have been developed as a green and recyclable alternative to traditional organic solvents in various applications ranging from synthesis, electrochemistry, catalysis, materials, separations and biotechnology, to the nuclear industry [10,11]. The formation of the inclusion complex of β-CD-TetraPhimBr was confirmed by various physico-chemical techniques including fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), 1H NMR spectroscopy and thermogravimetric analysis (TGA)

FTIR Analysis

XRD Analysis

TG Analysis

Measurements

Preparation of the β-CD-TetraPhimBr Inclusion Complex

Conclusions