Redox reactions of neutral red. A pulse radiolysis study

Guha, Shambhu N. ; Moorthy, Pervaje N. ; Mittal, Jai P. (1993) Redox reactions of neutral red. A pulse radiolysis study Journal of the Chemical Society, Perkin Transactions 2 (3). pp. 409-415. ISSN 0300-9580

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One-electron reduction and oxidation reactions of the phenazine dye neutral red (NR) have been studied in homogeneous aqueous medium at different pHs employing various reducing {hydrated electron, H atom, isopropyl ketyl [(CH3)2COH]} and oxidizing (Cl2-, TI2+, Br, Br2-, N3) radicals. The absorption spectra of the product transient species (semireduced and semioxidized neutral red) and their kinetic parameters have been evaluated. By monitoring the absorbance changes as a function of pH pKa, values of 2.4 ± 0.2 for the semireduced species and 2.9 ± 0.2 and 6.7 ± 0.2 for the semioxidized neutral red have been determined. While all the radicals employed in this investigation react completely by electron transfer, H and OH are found to react to the extent of 42 ± 5% and 100% respectively with neutral red to bring about adduct formation. The one-electron oxidation potential of neutral red has been evaluated.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:25674
Deposited On:04 Dec 2010 11:56
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