Investigation into the brown—walker reaction—IV. Optical studies of the surface conditions

✍ Scribed by A. Bewick; D.J. Brown

• Book ID: 103065668
• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 570 KB
• Volume: 21
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(76)85074-8

✦ Synopsis

Modulated

Specular Reflectance Spectroscopy was used to investigate the changes occurring at a platinum electrode as the surface conditions were established for the Kolbe coupling reaction in aqueous solution. Acetate and monoethyl malonate both gave similar results. The optical effects were interpreted in terms of oxide formation, foliowed by the adsorption of a primary layer of radicals at higher potentials, and a secondary adsorbed layer at still higher potentials. The primary layer was formed at potentials cathodic to dimer formation and the secondary layer was observed at potentials in the Kolbe region. The absorption spectrum of the anion formed by cathodic reduction of ethyl bromoacetate in dimethylformamide was also recorded and evidence was presented for the formation of this same anion by cathodic reduction of the adsorbed radicals produced in the Kolbe electrolysis of monoethybnalonate