Synthesis, Spectroscopy, and Electrochemistry of (α-Diimine)M(CO) 3 Br, M = Mn, Re, Complexes: Ligands Isoelectronic to Bipyridyl Show Differences in CO 2 Reduction

The synthesis and characterization of new Mn(I)- and Re(I)-centered organometallic complexes fashioned with 1,4-diazabutadiene (DAB) ligands is reported. Ten compounds of the type -(α-diimine)M(CO) Br (M = Mn, Re) were obtained in moderate to excellent yield (35-80%) and high purity from the coordin...

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Bibliographic Details
Published in:Organometallics 2014-09, Vol.34 (1), p.3
Main Authors: Vollmer, Matthew V, Machan, Charles W, Clark, Melissa L, Antholine, William E, Agarwal, Jay, Schaefer, 3rd, Henry F, Kubiak, Clifford P, Walensky, Justin R
Format: Article
Language:English
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Summary:The synthesis and characterization of new Mn(I)- and Re(I)-centered organometallic complexes fashioned with 1,4-diazabutadiene (DAB) ligands is reported. Ten compounds of the type -(α-diimine)M(CO) Br (M = Mn, Re) were obtained in moderate to excellent yield (35-80%) and high purity from the coordination of the five ligands with M(CO) Br in refluxing ethanol. Despite the electronic similarity of DAB to 2,2'-bipyridyl, the complexes described herein were poor mediators of electrochemical CO conversion to CO, but provide insight into the role of redox-active ligands in catalysis. Additional characterization of the one-electron reduced rhenium compounds, relevant intermediates in CO reduction, by EPR and single-crystal X-ray analysis is described.
ISSN:0276-7333