Volume 127, Issue 7 pp. 2123-2127
Zuschrift

Influence of Ligand Architecture on Oxidation Reactions by High-Valent Nonheme Manganese Oxo Complexes Using Water as a Source of Oxygen

Prasenjit Barman

Prasenjit Barman

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 (India)

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Dr. Anil Kumar Vardhaman

Dr. Anil Kumar Vardhaman

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 (India)

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Dr. Bodo Martin

Dr. Bodo Martin

Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing (IWR), Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)

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Svenja J. Wörner

Svenja J. Wörner

Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing (IWR), Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)

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Dr. Chivukula V. Sastri

Corresponding Author

Dr. Chivukula V. Sastri

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 (India)

Chivukula V. Sastri, Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 (India)

Peter Comba, Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing (IWR), Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)

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Prof. Dr. Peter Comba

Corresponding Author

Prof. Dr. Peter Comba

Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing (IWR), Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)

Chivukula V. Sastri, Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 (India)

Peter Comba, Anorganisch-Chemisches Institut and Interdisciplinary Center for Scientific Computing (IWR), Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany)

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First published: 29 December 2014
Citations: 23

Research support was provided by the Department of Science and Technology, India (SR/S1/IC-02/2009) and the Council for Scientific & Industrial Research (01(2527)/11/EMR-II) to C.V.S. Support by the University of Heidelberg is gratefully acknowledged.

Abstract

Mononuclear nonheme MnIVO complexes with two isomers of a bispidine ligand have been synthesized and characterized by various spectroscopies and density functional theory (DFT). The MnIVO complexes show reactivity in oxidation reactions (hydrogen-atom abstraction and sulfoxidation). Interestingly, one of the isomers (L1) is significantly more reactive than the other (L2), while in the corresponding FeIVO based oxidation reactions the L2-based system was previously found to be more reactive than the L1-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 (σ versus π) and concomitant steric effects.

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