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      Reply to: “A double bond with weak σ- and strong π-interactions is still a double bond”

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          Silicon–silicon π single bond

          A carbon–carbon double bond consists of a σ bond and a π bond. Recently, the concept of a π single bond, where a π bond is not accompanied by a σ bond, has been proposed in diradicals containing carbon and heteroatom radical centers. Here we report a closed-shell compound having a silicon–silicon π single bond. 1,2,2,3,4,4-Hexa-tert-butylbicyclo[1.1.0]tetrasilane has a silicon−silicon π single bond between the bridgehead silicon atoms. The X-ray crystallographic analysis shows that the silicon−silicon π single bond (2.853(1) Å) is far longer than the longest silicon−silicon bond so far reported. In spite of this unusually long bond length, the electrons of the 3p orbitals are paired, which is confirmed by measurement of electron paramagnetic resonance, and magnetic susceptibility and natural bond orbital analysis. The properties of the silicon−silicon π single bond are studied by UV/Vis and 29Si NMR spectroscopy, and theoretical calculations.
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            Author and article information

            Contributors
            kyushin@gunma-u.ac.jp
            ishida@tohoku.ac.jp
            hmatumoto@gunma-u.ac.jp
            Journal
            Nat Commun
            Nat Commun
            Nature Communications
            Nature Publishing Group UK (London )
            2041-1723
            29 June 2021
            29 June 2021
            2021
            : 12
            : 4036
            Affiliations
            [1 ]GRID grid.256642.1, ISNI 0000 0000 9269 4097, Division of Molecular Science, Graduate School of Science and Technology, , Gunma University, Kiryu, ; Gunma, Japan
            [2 ]GRID grid.69566.3a, ISNI 0000 0001 2248 6943, Department of Chemistry, Graduate School of Science, , Tohoku University, ; Sendai, Japan
            [3 ]GRID grid.256642.1, ISNI 0000 0000 9269 4097, Division of Pure and Applied Science, Graduate School of Science and Technology, , Gunma University, Maebashi, ; Gunma, Japan
            Author information
            http://orcid.org/0000-0003-2465-9400
            http://orcid.org/0000-0001-7832-912X
            http://orcid.org/0000-0002-2552-6370
            http://orcid.org/0000-0002-7971-6436
            Article
            24239
            10.1038/s41467-021-24239-w
            8242024
            34188022
            3f6dc8f9-8b55-483a-8e5c-a502892b6b06
            © The Author(s) 2021

            Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

            History
            : 9 December 2020
            : 9 June 2021
            Categories
            Matters Arising
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            © The Author(s) 2021

            Uncategorized
            chemical bonding,organometallic chemistry
            Uncategorized
            chemical bonding, organometallic chemistry

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