Characterization of Cu(II)-ACC Complexes and Conversion of the Bound ACC into Ethylene in the Presence of Hydrogen Peroxide. Detection of a Brown Intermediate at Low Temperature

Ghattas, Wadih; Giorgi, Michel; Gaudin, Christian; Rockenbauer, Antal; Réglier, Marius; Simaan, A. Jalila

doi:https://doi.org/10.1155/2007/43424

Bioinorganic Chemistry and Applications

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Research Article | Open Access

Volume 2007 | Article ID 043424 | https://doi.org/10.1155/2007/43424

Characterization of Cu(II)-ACC Complexes and Conversion of the Bound ACC into Ethylene in the Presence of Hydrogen Peroxide. Detection of a Brown Intermediate at Low Temperature

Wadih Ghattas,¹Michel Giorgi,²Christian Gaudin,¹Antal Rockenbauer,³Marius Réglier,¹and A. Jalila Simaan¹

Academic Editor: Marc Fontecave

Received26 Mar 2007

Accepted16 Jul 2007

Published02 Sept 2007

Abstract

Two copper(II)-ACC complexes were prepared and characterized: [Cu(bpy)(ACC)(H2O)]⋅CO4 (1) and [Cu(ACC)2]3⋅4H2O (2). Their crystallographic structures are described and analyzed. Spectroscopic characterizations (UV-visible and EPR) confirm that the structure is maintained in solution. These complexes are able to produce ethylene in the presence of hydrogen peroxide in an “ACC Oxidase-like” reaction in water and in methanol. The conversion of ACC into ethylene depends on the amount of base, and, in methanol, 3 equivalents of NaOH are needed for optimum activity. The base is proposed to play a role in H2O2 deprotonation. The presence of an exogenic ligand (bpy) is important for the reactivity and may stabilize a reaction intermediate. Indeed, a brown intermediate with an absorption band centered at 433 nm can be detected at low temperature when 1 is treated with 10 equivalents of H2O2.

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Copyright © 2007 Wadih Ghattas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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