Electronic structures of metal complexes containing the π-cyclopentadienyl and related ligands. Part 2.—He I photoelectron spectra of the open-shell metallocenes

Abstract

He I photoelectron spectra are reported for the metallocene species (C₅H₅)₂V, (C₅H₅)₂Cr, (C₅H₅)₂Mn, (C₅H₅)₂Co and (C₅H₅)₂Ni, and for their 1,1′-dimethyl derivatives. The metal 3d ionisation structure is discussed in terms of ligand field theory. The unusual spectrum of (C₅H₄Me)₂ Mn is interpreted in terms of a high-spin/low-spin equilibrium in the gas phase.