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Two copper(II)-ACC complexes were prepared and characterized: [Cu(bpy)(ACC)(H  2   O    )]    ⋅CO   4(    1    ) and[  Cu    (  ACC  )   2   ]   3⋅4   H  2   O(    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 inH  2    O  2deprotonation. 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 when1is treated with 10 equivalents ofH  2    O  2.

bioinorganic chemistry and applications/bioinorganic chemistry and applications

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