title: Primary amine stabilization of a dicopper(III) bis(μ-oxo) species: modeling the ligation in pMMO.
abstract: Here we report the formation of the first examples of dicopper(III) bis(μ-oxo) complexes ligated by the primary amines, propylenediamine, and N,N,-dimethyl propylenediamine. Stabilization of these new compounds is effected at -125 °C by "core capture"- introduction of exogenous ligand to a preformed dicopper(III) bis(μ-oxo) complex supported by the peralkylated tetramethyl propylenediamine. Primary amine ligation in these compounds matches the single primary amine coordination of the putative active site of particulate methane monooxygenase (pMMO) and polysaccharide monooxygenase. Reactivity studies presented here show primary amine ligated cores are competent oxidants, capable of activating C-H bonds by an H-atom abstraction mechanism. Trends in spectroscopy, structure, and reactivity provide hints to the potential role of primary amine ligation in pMMO: increased substrate accessibility to the redox active orbitals of the Cu2O2 core and greater stabilization of the oxidant without attenuation of oxidizing power.
authors.affiliation: Department of Chemistry, Stanford University , Stanford, California 94305, United States.
authors.forename: Cooper
authors.initials: C
authors.lastname: Citek
authors.forename: Bo-Lin
authors.initials: BL
authors.lastname: Lin
authors.forename: Tim E
authors.initials: TE
authors.lastname: Phelps
authors.forename: Erik C
authors.initials: EC
authors.lastname: Wasinger
authors.forename: T Daniel P
authors.initials: TD
authors.lastname: Stack
mesh_terms: D000588:Amines / Q000737:chemistry* / Q000378:metabolism; D003300:Copper / Q000737:chemistry* / Q000378:metabolism; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D010105:Oxygenases / Q000737:chemistry* / Q000378:metabolism; D011789:Quantum Theory
chemical_list: D000588:Amines; D008024:Ligands; D009942:Organometallic Compounds; D003300:Copper; D010105:Oxygenases; C021555:methane monooxygenase