Abstract
The unique reactivity of MgFe + is described. This cluster reacts with linear alkenes (C 2 -C 6 ) by displacement of magnesium to form an Fe + -olefin product. In contrast, MgFe + reacts with alcohols by displacement of the iron to form a Mg + -alcohol product. This is the first example of a changeover in the relative metal-ligand bond energies with both metals in a dimer being selectively displaced. MgFe + also reacts with cyclic alkenes. For example, it dehydrogenates cyclohexene to form MgFe + -benzene, which reacts further to displace the magnesium and form benzene-Fe + -cyclohexene. MgFe + is unreactive with small alkanes (C 2 -C 4 ) but reacts with larger alkanes (C 5 -C 7 ) to form a MgFe + -alkene product. An uppere limit of 34±5 kcal/mol for D°(Mg + -Fe) has been established by use of ion-molecule reactions
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