Covalency in Bis([8]annulene)uranium from Photoelectron Spectroscopy with Variable Photon Energy

John G. Brennan, Jennifer C. Green, Catherine M. Redfern

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72 Scopus citations


Relative partial photoionization cross sections and photoelectron branching ratios of the valence bands (6-22-eV binding energy) of bis([8]annulene)uranium(IV) are reported over the photon energy range 24–125 eV. The f-1 band shows cross-section features attributable to 5f resonant photoemission in the vicinity of the 5d →5f giant resonant absorption (hv = 101 and 110 eV). The e2g1 and e2u1 bands also show small cross-section maxima at these energies, that for the e2u1 ionization being the more intense. The f-1 band shows a large maximum at 39 eV, which is assigned to a delayed maximum due to the centrifugal barrier. The three highest ionization energy bands (from ligand-based orbitals) show essentially monotonic cross section decrease with photon energy. The mapping of the intensity changes of the f-1 band by the e2u-1band provides strong evidence for f orbital covalency in this molecule.

Original languageEnglish (US)
Pages (from-to)2373-2377
Number of pages5
JournalJournal of the American Chemical Society
Issue number7
StatePublished - Mar 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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