Photochemical transformation of iminodiacetic acid induced by complexation with copper(II) in aqueous solution

✍ Scribed by G. Mailhot; S.L. Andrianirinaharivelo; M. Bolte

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 509 KB
• Volume: 87
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(94)03962-t

✦ Synopsis

The photodegradation of copper(I1) iminodiacetate (&IDA) was studied at 20 "C using monochromatic excitation at various pH values. The 1:l complex between copper(I1) and iminodiacetic acid was present under our experimental conditions. The initial quantum yield of CuIDA transformation, determined by high performance liquid chromatography (HPLC), was low and independent of pH. A redox process was observed giving rise to Cu', HCHO, CO2 and glycine. In the presence of oxygen, the immediate re-oxidation of copper(I) into copper(J1) occurred, giving a veIy interesting catalytic aspect to the system. In neutral solution, copper(I1) was complexed by glycine (the main photoproduct of CuIDA transformation) and the photodegradation continued, to give Cu', NH,+, CO2 and HCHO.