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

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