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The resulting complexes represent the first known complexes containing unsupported, neutral \u03c3<jats:sub>B\u2212B<\/jats:sub> diborane ligands. Single\u2010crystal X\u2010ray analyses of these complexes show that the X\u2212Cu moiety (X=Cl, OTf, C<jats:sub>6<\/jats:sub>F<jats:sub>5<\/jats:sub>) lies opposite the bridging hydrogen atom of the diborane and is near perpendicular to the B\u2212B bond, interacting almost equally with both boron atoms and causing a B\u2212B bond elongation. DFT studies show that \u03c3\u2005donation from and \u03c0\u2005backdonation to the pseudo\u2010\u03c0\u2010like B\u2212B bond account for their formation. Astoundingly, these copper \u03c3<jats:sub>B\u2212B<\/jats:sub> complexes are inert to ligand exchange with pyridine under either heating or photoirradiation.<\/jats:p>","DOI":"10.1002\/anie.201801722","type":"journal-article","created":{"date-parts":[[2018,3,15]],"date-time":"2018-03-15T11:59:20Z","timestamp":1521115160000},"page":"6347-6351","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Bottleable Neutral Analogues of [B<sub>2<\/sub>H<sub>5<\/sub>]<sup>\u2212<\/sup> as Versatile and Strongly Binding \u03b7<sup>2<\/sup> Donor Ligands"],"prefix":"10.1002","volume":"57","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7099-2928","authenticated-orcid":false,"given":"Sunewang R.","family":"Wang","sequence":"first","affiliation":[{"name":"Institute for Inorganic Chemistry Julius-Maximilians-Universit\u00e4t W\u00fcrzburg  Am Hubland 97074 W\u00fcrzburg Germany"},{"name":"Institute for Sustainable Chemistry &amp; Catalysis with Boron Julius-Maximilians-Universit\u00e4t W\u00fcrzburg  Am Hubland 97074 W\u00fcrzburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominic","family":"Prieschl","sequence":"additional","affiliation":[{"name":"Institute for Inorganic Chemistry Julius-Maximilians-Universit\u00e4t W\u00fcrzburg  Am Hubland 97074 W\u00fcrzburg Germany"},{"name":"Institute for Sustainable Chemistry &amp; 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