The reactions of (dpp-BIAN)Zn−Zn(dpp-BIAN) (1) with PhCCH and of [(dpp-BIAN)Zn(μ-I)]2 (2) with potassium hydride yield the binuclear complexes [(dpp-BIAN)Zn(μ-CCPh)]2 (3) and [(dpp-BIAN)Zn(μ-H)]2 (4), respectively (dpp-BIAN = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene). Complex 3 is also obtained by thermal dehydrogenation of [dpp-BIAN(H)]Zn(CCPh) (5), which in turn can be prepared by reacting ZnI2 with equimolar amounts of [dpp-BIAN(H)]Na and PhCCNa. The paramagnetic compounds 3 and 4 have been characterized by ESR spectroscopy; the diamagnetic complex 5, by 1H NMR spectroscopy. The molecular structures of 3 and 4 have been determined by single-crystal X-ray diffraction. The electronic structure of complex 4 has been examined by DFT.
Radikale Hilfe: Mit einem spinmarkierten Liganden wurde eine Verbindung mit einer Zink‐Zink‐Bindung erhalten, die durch Radikalanionenliganden unterstützt wird (siehe Schema). Dank des Radikalanions ließ sich das Vorliegen der Zn‐Zn‐Bindung in Lösung durch ESR‐Messungen bestätigen. DFT‐Rechnungen charakterisieren die Verbindung als ein Diradikal, dessen Zn‐Zn‐Bindung vor allem durch die Metall‐s‐Orbitale gebildet wird.
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