Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/7029
Title: Electrochemical behaviour of some industrially important azonaphthol derivatives at glassy carbon electrode
Authors: Jayadevappa, H
Shivaraj, Y
Mahadevan, K M
Kumaraswamy, B E
Sathpathi, A K
Sherigara, B S
Keywords: Voltammetry
Azo dyes
Azonaphthol derivatives
Glassy carbon electrode
Issue Date: May-2006
Publisher: CSIR
Series/Report no.: C07C245/02
Abstract: Electroreduction of – N = N – and – NO<sub>2</sub> groups of azodyes, 1-(4-nitro phenyl) -azo-2-naphthol (A), 1-(3-nitrophenyl)-azo-2-naphthol (B), 1-(2-nitrophenyl)-azo 2-naphthol (C) has been studied. The azo compound not containing - NO<sub>2</sub> group taken for the study was 1-(2-hydroxyphenyl)-azo-2-naphthol (D). The studies were carried out in partial aqueous media containing organic co-solvents such as acetonitrile, DMF and methanol. The substituent effect on cathodic reduction potentials <i style="">E</i><sub>pc </sub>in case of dyes A, B, C were studied and it was found to be in increasing order i.e. <i style="">E</i><sub>pc(A)</sub> < <i style="">E</i><sub>pc(B)</sub> < <i style="">E</i><sub>pc(C)</sub>. During electroreduction of dyes A, B, and C, two separate quasireversible peaks, one for reductive cleavage of – N = N – groups, the other one due to reduction of – NO<sub>2</sub> group into – NH<sub>2</sub> groups were observed. The redox process has been compared with the cyclic voltammetry of the trial compounds, 2-nitroaniline and 4-amino-3-hydroxy naphthalene-1-sulphonic acid. The other data such as effect of <i style="">p</i>H, concentration of active species, supporting electrolyte, scan rate on cathodic reduction peak potential and cathodic peak current has been determined. The process is found to be diffusion controlled.
Description: 269-274
URI: http://hdl.handle.net/123456789/7029
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.13(3) [May 2006]

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