UV Photoelectron Spectra of Some Bent Bis(η5 -cyclopentadienyl) Niobium and Tantalum Complexes

Henk van Dam 1 , Andries Terpstra 1 , Ad Oskam 1 , and Jan H. Teuben 2
  • 1 Anorganisch Chemisch Laboratorium, University of Amsterdam, J. H. van't Hoff Instituut, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
  • 2 Laboratorium voor Anorganische Chemie, Rijksuniversiteit, Nijenborgh 16, 9747 AG Groningen, The Netherlands


He(I) and He(II) photoelectron spectra are reported for (η5-C5H5)2MLX (M = Nb, Ta; L = H, CO; X - propene, 1-butene, propyl) and some methylcyclopentadienyl deriva-tives. Also the spectra of some π-allyl and dihalide complexes are reported. Unambiguous assignments could be made of the metal d a1 orbital, the Cp orbitals, the olefin π ionization and the M-hydride and π-allyl orbitals. Very regular trends are observed in the ionization energies upon substitution of the ligands. The olefin π ionization is found at very low energy indicating that the π backbonding to the olefin is very important. He(I)/He(II) cross section differences show clearly differences in metal character of the various M.O.'s.

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