Bottleable neutral analogues of [B2H5]- as versatile and strongly binding eta2 donor ligands

Wang, Sunewang R, Prieschl, Dominic, Mattock, James D, Arrowsmith, Merle, Pranckevicius, Conor, Stennett, Tom E, Dewhurst, Rian D, Vargas, Alfredo and Braunschweig, Holger (2018) Bottleable neutral analogues of [B2H5]- as versatile and strongly binding eta2 donor ligands. Angewandte Chemie International Edition, 57 (21). pp. 6347-6351. ISSN 1433-7851

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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 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.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science > QD Chemistry
Depositing User: Alfredo Vargas
Date Deposited: 19 Mar 2018 16:09
Last Modified: 01 Jul 2019 18:46

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