Negative-ion photoelectron spectrum of tricarbonyl(η5-methylcyclopentadienyl)manganate(0)

Fixed-frequency negative-ion photoelectron spectra of tricarbonyl(η5-methylcyclopentadienyl)manganate(0), Cp*Mn(CO)3-, are obtained at 355 and 532 nm. The adiabatic electron affinity of tricarbonyl(η5-methylcyclopentadienyl)manganese(I), Cp*Mn(CO)3, as obtained from the experiments, is 0.5 &plusmn 0.1 eV, and the vertical ionization potential of the anion is 1.0 &plusmn 0.1 eV. By combining our electron affinity results with literature gas-phase acidity estimates for Cp*Mn(CO)3 we determine that the C-H bond dissociation energy, D[H-CH2C5H4Mn(CO)3-], in the anion is 2.2 &plusmn 0.8 eV.