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A High‐Valent Non‐Heme μ‐Oxo Manganese(IV) Dimer Generated from a Thiolate‐Bound Manganese(II) Complex and Dioxygen

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [4];  [4];  [2];  [5];  [3];  [2];  [3];  [3]
  1. Univ. Grenoble Alpes, CNRS, UMR 5250, DCM 38000 Grenoble France, Univ. Grenoble Alpes, CNRS, UMR 5249, LCBM 38000 Grenoble France
  2. Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science The University of Manchester 131 Princess Street Manchester M1 7DN UK
  3. Univ. Grenoble Alpes, CNRS, UMR 5250, DCM 38000 Grenoble France
  4. European Synchrotron Radiation Facility (ESRF) 71 Avenue des Martyrs 38000 Grenoble France
  5. Department of Chemistry Humboldt-Universität zu Berlin Brook-Taylor-Strasse 2 12489 Berlin Germany
Abstract

This study deals with the unprecedented reactivity of dinuclear non‐heme Mn II –thiolate complexes with O 2 , which dependent on the protonation state of the initial Mn II dimer selectively generates either a di‐μ‐oxo or μ‐oxo‐μ‐hydroxo Mn IV complex. Both dimers have been characterized by different techniques including single‐crystal X‐ray diffraction and mass spectrometry. Oxygenation reactions carried out with labeled 18 O 2 unambiguously show that the oxygen atoms present in the Mn IV dimers originate from O 2 . Based on experimental observations and DFT calculations, evidence is provided that these Mn IV species comproportionate with a Mn II precursor to yield μ‐oxo and/or μ‐hydroxo Mn III dimers. Our work highlights the delicate balance of reaction conditions to control the synthesis of non‐heme high‐valent μ‐oxo and μ‐hydroxo Mn species from Mn II precursors and O 2 .

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1401557
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 28 Vol. 56; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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