Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 7, Pages 2095-2099Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201409476
Keywords
density functional calculations; isomers; manganese; oxidation; structure elucidation
Categories
Funding
- Department of Science and Technology, India [SR/S1/IC-02/2009]
- Council for Scientific & Industrial Research [01(2527)/11/EMR-II]
- University of Heidelberg
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Mononuclear nonheme Mn-IV=O complexes with two isomers of a bispidine ligand have been synthesized and characterized by various spectroscopies and density functional theory (DFT). The Mn-IV=O complexes show reactivity in oxidation reactions (hydrogen-atom abstraction and sulfoxidation). Interestingly, one of the isomers (L-1) is significantly more reactive than the other (L-2), while in the corresponding Fe-IV=O based oxidation reactions the L-2-based system was previously found to be more reactive than the L-1-based catalyst. This inversion of reactivities is discussed on the basis of DFT and molecular mechanics (MM) model calculations, which indicate that the order of reactivities are primarily due to a switch of reaction channels (sigma versus pi) and concomitant steric effects.
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