摘要：

Iron methoxide cation, Fe(OCH3)+ (1), and its tautomer, the formaldehyde complex of the iron hydride cation, HFe(OCH2)+ (2), have been examined in combined mass spectrometric and computational studies. Although the experimental methods used for ion generation yield two isomers, largely because intermolecular isomerization is facile, differentiation of them is straightforward. Fe(OCH3)+ corresponds to the global minimum of the [Fe,C,H3,O]+ potential-energy hypersurface with an experimentally determined bond-dissociation energy of 69 ± 2 kcal/mol for the Fe+OCH3 bond. In the gas phase, Fe(OCH3)+ can isomerize via a β-hydrogen transfer to HFe(OCH2)+, which is experimentally found to be 15 ± 4 kcal/mol less stable than Fe(OCH3)+. The experiments suggest and the calculations predict that the two isomers are separated by a significant activation barrier. According to the calculations both species exhibit quintet ground states and the transition structure associated with their interconversion on the quintet pot...

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