Bottleable Neutral Analogues of [B2H5]− as Versatile and Strongly Binding η2 Donor Ligands |
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| Authors: | Dr. Sunewang R. Wang Dominic Prieschl James D. Mattock Dr. Merle Arrowsmith Dr. Conor Pranckevicius Dr. Tom E. Stennett Dr. Rian D. Dewhurst Dr. Alfredo Vargas Prof. Dr. Holger Braunschweig |
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| Affiliation: | 1. Institute for Inorganic Chemistry, Julius-Maximilians-Universit?t Würzburg, Würzburg, Germany;2. Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universit?t Würzburg, Würzburg, Germany;3. Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, Sussex, UK |
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| Abstract: | Herein we report the discovery that two bottleable, neutral, base‐stabilized diborane(5) compounds are able to bind strongly to a number of copper(I) complexes exclusively through their B?B bond. The resulting complexes represent the first known complexes containing unsupported, neutral σB?B diborane ligands. Single‐crystal X‐ray analyses of these complexes show that the X?Cu moiety (X=Cl, OTf, C6F5) lies opposite the bridging hydrogen atom of the diborane and is near perpendicular to the B?B bond, interacting almost equally with both boron atoms and causing a B?B bond elongation. DFT studies show that σ donation from and π backdonation to the pseudo‐π‐like B?B bond account for their formation. Astoundingly, these copper σB?B complexes are inert to ligand exchange with pyridine under either heating or photoirradiation. |
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| Keywords: | boron copper density functional theory diboranes σ -complexes |
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