The Electrochemical Oxidation of 5-Thio-2-nitrobenzoic acid (TNBA) at a Boron Doped Diamond Electrode: Demonstration of a CEC Reaction

✍ Scribed by Olga Nekrassova; Nathan S. Lawrence; Richard G. Compton

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 116 KB
• Volume: 15
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200302766

✦ Synopsis

Abstract

The oxidation of 5‐thio‐2‐nitrobenzoic acid (TNBA) over a wide pH range has been investigated using cyclic voltammetry at a boron doped diamond electrode. The reaction has been shown to proceed via a CEC reaction process in which at lower pH the thiol moiety of the TNBA species has to undergo deprotonation before oxidation. DIGISIM modelling of the voltammetric profiles deduced a value of 5.2 for the pK~a~ of the thiol moiety which is in good agreement with that obtained from spectrophotometric data. Also reported are the rate constants for all the heterogeneous and homogeneous processes.