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Stable Five- and Six-Coordinate Cobalt(III) Complexes with a Pentadentate Bispidine Ligand


  • Generous financial support by DFG (Deutsche Forschungsgemeinschaft) and the University of Heidelberg are gratefully acknowledged.


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I am ligand: A pentadentate bispidine ligand with two tertiary amine and three pyridine donors stabilizes the uncommon intermediate-spin electronic configuration of CoIII (S=1; see picture: C gray, N blue, O red, Co violet). Dissociation of the monodentate coligand yields a catalytically active pentacoordinate complex.

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