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Primary Amine Stabilization of a Dicopper(lll) Bis(µ-oxo) Species: Modeling the Ligation in pMMO.

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Title: Primary Amine Stabilization of a Dicopper(lll) Bis(µ-oxo) Species: Modeling the Ligation in pMMO.
Authors: Citek, Cooper1, Bo-Lin Lin1, Phelps, Tim E.2, Wasinger, Erik C.2, Stack, T. Daniel P.1 stack@stanford.edu
Source: Journal of the American Chemical Society. 10/15/2014, Vol. 136 Issue 41, p14405-14408. 4p. 2 Color Photographs, 3 Diagrams, 1 Chart.
Subjects: Copper compounds synthesis, Amines, Propene, Polysaccharides, Methane monooxygenase
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(lll) 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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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(lll) 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. [ABSTRACT FROM AUTHOR]
ISSN:00027863
DOI:10.1021/ja508630d