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              <p>A Lewis superacidic bis(borane) C6F4{B(C6F5)2}2 was reacted with tungsten N2-complexes [W(N2)2(R2PCH2CH2PR2)2] (R = Ph or Et), affording zwitterionic boryldiazenido W(II) complexes trans-[W(L)(R2PCH2CH2PR2)2(N2{B(C6F5)2(C6F4B(C6F5)3})] (L = ø, N2 or THF). Those compounds feature only one N-B linkage of covalent type, as a result of intramolecular boron-to-boron C6F5 transfer. Complex trans-[W(THF)(Et2PCH2CH2PEt2)2(N2{B(C6F5)2C6F4B(C6F5)3})] (5) was shown to split H2, leading to a seven-coordinate complex [W(H)2(Et2PCH2CH2PEt2)2(N2{B(C6F5)2}2C6F4)] (7). Interestingly, hydride storage at the metal triggers backward C6F5 transfer. This reverts the bis(boron) moiety to its bis(borane) state, now doubly binding the distal N, with structural parameters and DFT computations pointing to dative N➝B bonding. By comparison with an N2 complex [W(H)2(Et2PCH2CH2PEt2)2(N2{B(C6F5)3}] (10) differing only by the Lewis acid (LA), namely B(C6F5)3, coordinated to the distal N, we demonstrate that two-fold LA coordination imparts strong N2 activation up to the diazene-diide (N22–) state. To the best of our knowledge, this is the first example of a neutral LA coordination that induces reduction of N2.</p>
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              <country key="FR"/>
            </address>
            <ref type="url">https://www.universite-lyon.fr/</ref>
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        <org type="institution" xml:id="struct-210962" status="VALID">
          <orgName>École Supérieure de Chimie Physique Électronique de Lyon</orgName>
          <orgName type="acronym">CPE</orgName>
          <desc>
            <address>
              <addrLine>Domaine Scientifique de la DouaBâtiment Hubert Curien 43 Boulevard du 11 Novembre 191869616 Villeurbanne</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.cpe.fr/</ref>
          </desc>
        </org>
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        <org type="anrProject" xml:id="projanr-56704" status="VALID">
          <idno type="anr">ANR-21-CE07-0003</idno>
          <orgName>PUNCh</orgName>
          <desc>Combinaison de stratégies "push-push" et "push-pull" pour reproduire la chimie de la nitrogénase</desc>
          <date type="start">2021</date>
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