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A “Side-on” Superoxonickel Complex [LNi(O2)] with a Square-Planar Tetracoordinate Nickel(II) Center and Its Conversion into [LNi(μ-OH)2NiL]


  • Financial support from the Cluster of Excellence “Unifying Concepts in Catalysis” (EXC 314/1) by the Deutsche Forschungsgemeinschaft is gratefully acknowledged. We thank Prof. P. Hildebrandt (TU Berlin) and Dr. U. Kuhlmann for Resonance-Raman measurements and Prof. H. Schwarz (TU Berlin) for providing us 18O2 samples. L=β-diketiminato.


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Radically mild: The first room-temperature isolable, structurally characterized superoxonickel(II) complex 1 with a square-planar tetracoordinate NiII center is capable of gentle oxygen-transfer reactions to form the proposed intermediate 2, which acts as a hydrogen scavenger and dimerizes to homovalent complex 3 with both square-planar (low-spin) and tetrahedral (high-spin) NiII centers. L=CH{C(Me)(2,6-iPr2C6H3N}2.