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Factorial design analysis of the catalytic activity of di‐imine copper(II) complexes in the decomposition of hydrogen peroxide
Author(s) -
Alves W. A.,
De Almeida Azzellini M. A.,
De Costa Ferreira A. M.,
Bruns R. E.
Publication year - 2001
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.1044
Subject(s) - chemistry , hydrogen peroxide , imine , imidazole , catalysis , decomposition , copper , peroxide , pyridine , medicinal chemistry , oxygen , inorganic chemistry , ligand (biochemistry) , polymer chemistry , stereochemistry , organic chemistry , biochemistry , receptor
Factorial design analysis was applied to the study of the catalytic activity of di‐imine copper(II) complexes, in the decomposition of hydrogen peroxide. The studied complexes show a tridentate imine ligand ( apip ), derived from 2‐acetylpyridine and 2‐(2‐aminoethyl)pyridine, and a hydroxo or an imidazole group at the fourth coordination site of the copper ion. The factorial design models for both [Cu(apip)imH] 2+ and [Cu(apip)OH] + were similar. Increasing the peroxide concentration from 3.2 × 10 −3 to 8.1 × 10 −3 mol L −1 resulted in increased oxygen formation. Increasing the pH from 7 to 11 also increased oxygen formation and had an effect about twice as large as the peroxide one. Both complexes also had an important interaction effect between peroxide concentration and pH. However, increasing the catalyst concentration led to a decrease in total oxygen formation. The obtained results were corroborated by further data, achieved by using the usual univariate method, and helped to elucidate equilibrium steps occurring in the studied systems. In very alkaline solutions, the studied [Cu(apip)imH] 2+ complex can form the corresponding dinuclear species, [Cu 2 (apip) 2 im] 3+ . While the mononuclear complex proved to be an efficient catalyst in hydrogen peroxide decomposition, the corresponding dinuclear compound seemed to be able to coordinate with the dioxygen molecule, inhibiting its observed release. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 472–479, 2001