ISSN:
1572-901X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00620742
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