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Evidence for Cooperativity in the Disproportionation of H 2 O 2 Efficiently Catalyzed by a Tetranuclear Manganese Complex
Author(s) -
Dubé Christopher E.,
Wright David W.,
Armstrong William H.
Publication year - 2000
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20000616)39:12<2169::aid-anie2169>3.0.co;2-y
Subject(s) - disproportionation , cooperativity , manganese , chemistry , hydrogen peroxide , catalysis , base (topology) , kinetics , organic chemistry , biochemistry , mathematics , physics , mathematical analysis , quantum mechanics
The base sets the rhythm for a mixed‐valence Mn III (Mn IV ) 3 complex which catalyzes the disproportionation of hydrogen peroxide. The presence of the base 1,4,7‐trimethyl‐1,4,7‐triazacyclononane switches the catalysis kinetics from Michaelis–Menten type (Hill coefficient n =1.03) to cooperative (Hill coefficient n =1.58; see the figure). The cooperative catalytic behavior has the highest turnover constant reported to date for any synthetic manganese complex.