Abstract
Effect of buffer solutions of different pH and α-cyclodextrin (a-CD) on the absorption and fluorescence spectra of 4-hydroxy-3-methoxy benzoic acid (vanillic acid HMB) have been investigated. The inclusion complex of α-CD with HMB is investigated by UV-Visible and fluorimetry and Scanning Electron Microscope (SEM) methods. These studies show that HMB forms 1: 1 inclusion complex with α-CD. There is an unusual blue shift of hydroxyl ion (dianion) in the α-CD medium. This confirms that the -OH group is present in the interior part of the α-CD cavity and -COOH group is present in the upper part of the α-CD cavity. A mechanism is proposed to explain the inclusion process.
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