Abstract
p-Nitrobenzoic acid (PNBA) is studied by real-time detection of SERS spectra during time-resolved optical multichannel recording following the application of a double potential step to a Ag electrode. The spectral bands of three stable intermediate products, p-nitrosobenzoate, hydroxylamine, and azoxy compounds are observed. In addition, the transient bands of an unstable intermediate are seen at 996, 1233, and 1580 cm{sup {minus}1} with a lifetime of about 70 ms during the oxidation process of the hydroxylamine compound which itself is generated electrochemically by a 200-ms potential pulse. We suggest these bands represent the p-nitrosobenzoate free-radical anion intermediate formed during the oxidation of the hydroxylamine compound.
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