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Title: Electrochemical and fluorescence spectroscopic studies on the formation of inclusion complex of p-aminophenol with β-cyclodextrin
Authors: Gao, Zuoning
Li, Hulin
Issue Date: Oct-1999
Publisher: NISCAIR-CSIR, India
Abstract: The redox of p-aminophenol in the presence of β-cyclodextrin has been investigated by Osteryoung square wave voltammetry in phosphate buffer (pH 6.60). Electrochemical results indicate that β-cyclodextrin forms a 1:1 inclusion complex with quinoneimine, the oxidized product of p-aminophenol, rather than p-aminophenol itself. It causes both a decrease in the reduction peak current, (Ipc), as well as a negative shift in the reduction peak potential, (Epc), for quinoneimine reduction. The relationship between Ipc and the concentration of β-cyclodextrin has been studied. The dissociation constant of the inclusion complex as obtained by electrochemical method was found to be, Kd = 9.9×10-3 mol L-1. The diffusion properties of free quinoneimine as well as in the presence of β -cyclodextrin have been investigated by double potential-step chronocoulometry. Fluorescence spectra gave evidence for the complexation and the dissociation constant determined spectroscopically, Kd ’= 9.5×10-3 mol L-1, is in good agreement with that obtained by electrochemical methods.
Page(s): 1024-1028
Appears in Collections:IJC-A Vol.38A(10) [October 1999]

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