The Electronic Structure of Organometallic Complexes Involving f-Electrons, II Magnetic Susceptibility and Crystal Field Splitting of Uranium(IV)-tetracyclopentadienide

H.-D. Amberger 1 , R. D. Fischer 1  and B. Kanellakopulos 2
  • 1 Institut für Anorganische Chemie der Universität Erlangen-Nürnberg
  • 2 Institut für Heiße Chemie, Kernforschungszentrum Karlsruhe

Some significant features of the low-energy part of the crystal field (=CF) splitting pattern of the organometallic 5f2-system (η5-C5H5)4U(IV) can be deduced from the temperature dependence of the magnetic susceptibility which has been measured on polycrystalline samples between 1.1 and 298 K. The results of model calculations performed independently on the basis of three different semi-empirical approaches are compatible with the deductions from the experiments and allow estimates of the sign and order of magnitude of quantities like the CF-splitting parameters B40 and B60 viz. the (averaged) angular overlap parameters eσ and eπ„ and of the valence state ionisation potential of the 5f-electrons. Anticipating a rather weakly perturbed tetrahedral CF, the observed magnetic properties may be satisfactorily simulated if the six lowest-lying first-order CF-states and one common scaling factor are accounted for

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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.

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