Abstract

Even though Fe + 4 clusters in the gas phase have been demonstrated to be able to induce the cylotrimerization of added C 2H 2 ligands to benzene, the precursor ion Fe 4(C 2H 2) + 3 has not yet been structurally characterized. To improve our understanding of this type of ion, we compare the products obtained by the direct reaction of benzene with bare Fe + n clusters ( n = 2–11) to those obtained by dehydrogenative addition of ethane. Additional mass spectrometric studies such as collision-induced dissociation (CID) and thermoneutral ligand exchange with C 6D 6 suggest that the reaction of C 2H 4 with Fe + 4 produces at least two types of structural isomers, with a performed benzene molecule existing only in one of them (Fe 4C 6H + 6).

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