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Reduction Potentials of Naphthoxyl and Pyridoxyl Radicals in Aqueous Solutions

Published

Author(s)

T N. Das, Pedatsur Neta

Abstract

Reduction potentials of 1- and 2-naphthoxyl, 2-, 3-, and 4-pyridoxyl, and 4-phenylphenoxyl radicals in alkaline aqueous solutions were determined by pulse radiolysis. The potential of 1-naphthoxyl was determined to be 0.59 V vs. NHE from the redox equilibrium involving 1-naphthol, 3-methylphenol, and their radicals. The reduction potential of the 3-methylphenoxyl radical (0.73 V) was obtained from its equilibrium with the phenoxyl radical. The potential for 2-naphthoxyl (0.71 V) was obtained from equilibrium with the phenoxyl radical. The reduction potentials of the three pyridoxyl radicals were measured from the equilibria with the 4-cyanophenoxyl radical. The values were found to be 1.18 V for 2-pyridoxyl, 1.06 V for 3-pyridoxyl, and 1.24 V for 4-pyrodoxyl. The reduction potential of 4-phenylphenoxyl radical (0.93 V) was obtained from equlibrium with the I2.- radical. From these reduction potentials and the known pKa values of the phenolic compounds we estimated the O-H bond dissociation energies.
Citation
Journal of Physical Chemistry
Volume
102
Issue
35

Keywords

naphthols, naphthoxyl, pulse radiolysis, pyridols, pyridoxyl, reduction potentials

Citation

Das, T. and Neta, P. (1998), Reduction Potentials of Naphthoxyl and Pyridoxyl Radicals in Aqueous Solutions, Journal of Physical Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=831498 (Accessed April 23, 2024)
Created June 19, 1998, Updated February 17, 2017