The photoelectron spectra of enneacarbonyl-µ3-methylidyne-tricobalt and some derivatives

Abstract

The He(I) photoelectron spectra of compounds [Co₃(CO)₉(CY)], Y = H, F, Cl, Br, I, CH₃, or CF₃, and some He(II) spectra are reported and assigned. Ionizations corresponding to the CY group can be picked out, and in particular the level of mainly bridge C 2p_π character is detected in all the compounds. The variations in ionization energy of this level and others are used to show that there is substantial delocalization of the p_π levels of Y throughout the molecules. Calculations by the self consistent charge method are correlated with these measurements, and there is generally good agreement.