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The dication 1 is formally valence isoelectronic to the neutral, Me2(H)NMg(hpp)}2] and, Me2(H)NZn(hpp, 2] molecules, which feature two Mg1 or ZnI atoms directly connected to each other. No example of a stable molecular compound featuring a Mg-Mg single bond is known,[16] and the preparation of dinuclear zinc species featuring a direct Zn-Zn bond were reported only recently.[17] Major difficulties are disproportionation reactions leading to elemental magnesium or zinc and a mononuclear metal(II) compound. Calculations were carried out to shed light on the likely structures of such species (see Supporting Information, The Zn-Zn bond in, Me 2HN)Zn-(hpp)}2] is 230.2 pm, and is close to that measured in [Zn2Cp*2, 231 pm, Cp*, C 5(CH3)5, 17] According to our calculations, the Mg-Mg bond leng
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2]. The hpp ligand might be ideally suited to engage not only two boron, but also two zinc or even magnesium atoms in direct bonding to each other.
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