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On the electrochemical oxidation of 5‐hydroxy barbituric acid
Author(s) -
Berchmans Sheela,
Vijayavalli R.
Publication year - 1994
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140061125
Subject(s) - electrochemistry , chemistry , barbituric acid , cathodic protection , aqueous solution , horizontal scan rate , anode , inorganic chemistry , anodic oxidation , aqueous medium , electrode , cyclic voltammetry , organic chemistry
The electrochemical behavior of 5‐hydroxy barbituric acid (HB) has been investigated in aqueous and nonaqueous media. In aqueous medium, there is only one anodic peak at –50 mV (at v = 20 mV/s), and no cathodic peak is observed indicating an irreversible reaction under the conditions of this study. The cyclic voltammograms indicate a two‐electron transfer reaction corresponding to the oxidation of HB to alloxan monohydrate (AM). In nonaqueous medium, voltammetric response is observed both in the anodic as well as the cathodic directions. The anodic peak occurs at +140 mV and the cathodic peak occurs at –320 mV at v = 20 mV/s. At high scan rates ( v > 200 mV/s) there are two cathodic peaks. The mechanism of oxidation of HB is discussed, and the rate constants of the reaction are calculated.