Study of the cyclodextrin and its complexation with 2,4-dinitrobenzoic acid through photophysical properties and 2D NMR spectroscopy
作者:T. Stalin、K. Srinivasan、K. Sivakumar
DOI:10.1016/j.molstruc.2013.11.048
日期:2014.2
The host-guest inclusion complex formation of 2,4-dinitrobenzoic acid (2,4-DNB) with nano-hydrophobic cavity of beta-cyclodextrin (beta-CD) in solution phase were studied by UV-visible spectrophotometer and electrochemical method (cyclic voltammetry, CV). The prototropic behaviors of 2,4-DNB with and without beta-CD and the ground state acidity constant (pKa) of host-guest inclusion complex (2,4-DNB-beta-CD) was studied. The binding constant of the inclusion complex at 303 K was calculated using Benesi-Hildebrand plot. The solid inclusion complex formation between beta-CD and 2,4-DNB was confirmed by H-1 NMR, 2D H-1 NMR (ROESY), FT-IR, XRD and SEM analysis. A schematic representation of this inclusion process is proposed by molecular docking studies using the patch dock server. (C) 2013 Elsevier B.V. All rights reserved.