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Issue 3, 1993
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Redox reactions of neutral red. A pulse radiolysis study

Abstract

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)2ĊOH]} 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.

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Article type: Paper
DOI: 10.1039/P29930000409
Citation: J. Chem. Soc., Perkin Trans. 2, 1993, 409-415
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    Redox reactions of neutral red. A pulse radiolysis study

    S. N. Guha, P. N. Moorthy and J. P. Mittal, J. Chem. Soc., Perkin Trans. 2, 1993, 409
    DOI: 10.1039/P29930000409

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