Please use this identifier to cite or link to this item:
http://nopr.niscpr.res.in/handle/123456789/15945| 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] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 38A(10) 1024-1028.pdf | 1.04 MB | Adobe PDF | View/Open |
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.