Abstract
A β-cyclodextrin (β-Cyd) inclusion complex containing azomethine as a guest was prepared by kneading method with aliquot addition of ethanol. The product was characterized by Fourier Transform Infrared (FTIR) spectrometer, 1H Nuclear Magnetic Resonance (1H NMR) and Thermogravimetric Analyzer (TGA), which proves the formation of the inclusion complex where the benzyl part of azomethine has been encapsulated by the hydrophobic cavity of β-Cyd. The interaction of β-Cyd and azomethine was also analyzed by means of spectrometry by UV-Vis spectrophotometer to determine the formation constant. The formation constant was calculated by using a modified Benesi-Hildebrand equation at 25 °C. The apparent formation constant obtained was 1.29 × 104 L/mol. Besides that, the stoichiometry ratio was also determined to be 1:1 for the inclusion complex of β-Cyd with azomethine.
Highlights
The studies on supramolecular chemistry give a broad idea of intermolecular interactions where covalent bonds are not likely to form between the interacting species
The spectrum for the inclusion complex looks almost similar to the pure β-cyclodextrin
It indicates the formation of the inclusion complex, similar to a phenomenon observed by Li et al [15]
Summary
The studies on supramolecular chemistry give a broad idea of intermolecular interactions where covalent bonds are not likely to form between the interacting species Most of this interaction has been performed by host-guest interaction. 2013, 14 most promising to form inclusion complexes, especially with various guest molecules with suitable polarity and dimensions [1,2]. The special characteristic of cyclodextrins is the ability to form an inclusion complex with various organic molecules through host-guest interaction with the interior cavity that provides hydrophobic environment to trap an apolar pollutant [3]. Nepal et al [12] have introduced β-cyclodextrin to the poly (azomethines) to improve the solubility and processability of Schiff bases for various types of applications. Sensitive and selective methods for the characterization of inclusion complexes such as Fourier transform-infrared (FTIR) spectrometry, proton nuclear magnetic resonance (1H NMR) spectrometry, thermogravimetric analysis (TGA), and ultraviolet-visible (UV-Vis) spectrometry [13]
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