Transition Metal Chemistry

, Volume 6, Issue 5, pp 260–263 | Cite as

Synthesis of ferrocenylruthenocene

  • Eberhard W. Neuse
  • Mohamed S. Loonat
Full Papers


The dinuclear metallocene, ferrocenylruthenocene, is synthesized by Ullmann coupling of iodoruthenocene with a large excess of iodoferrocene in the melt phase. The compound's ligand-vibrational modes, as reflected in the i.r. spectrum, are virtually identical with those in biferrocene; so is the symmetric ring-metal-ring stretching mode manifested in the low-frequency Raman region. The mass-spectral fragmentation pattern indicates preferential loss of a cyclopentadienyl radical from the ferrocene rather than the ruthenocene unit in conformance with both the lower metal-ring bond strength in, and lower ionization energy of, the iron complex. The1H n.m.r. patterns of the two metallocene groups, at 90 MHz, are sufficiently well separated from each other to allow their individual evaluation; this finding could have a significant bearing on the characterization of ferrocenylene-ruthenocenylene copolymers of future synthetic programs.


Bond Strength Ionization Energy Ferrocene Fragmentation Pattern Iron Complex 
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Copyright information

© Verlag Chemie GmbH 1981

Authors and Affiliations

  • Eberhard W. Neuse
    • 1
  • Mohamed S. Loonat
    • 1
  1. 1.Department of ChemistryUniversity of the WitwatersrandJohannesburgRepublic of South Africa

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