Abstract
The formal metal(III) cations [CoO 2H 2] + and [NiO 2H 2] + can be generated by electrospray ionization of aqueous solutions of the corresponding metal(II) nitrates. In contrast to M Fe, the fragmentations of [CoO 2H 2] + and [NiO 2H 2] + imply that the hydrated metal-oxide cations, (H 2O)MO +, are more favorable compared to the dihydroxo isomers M ( OH ) 2 + than for M Fe. The experimental data are corroborated by density functional calculations of the [ MO 2 H 2 ] + surfaces for M Fe–Ni, which predict Fe ( OH ) 2 + to be more stable than (H 2O)FeO +, whereas the opposite applies for M Ni and both isomers are energetically close for M Co.
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