Synthesis, Characterization, and EPR Spectral Studies of the Multimetal Species [Fe(MS4)2]3- (M = Mo, W)

G. Delbert Friesen, John W. Mcdonald, William E. Newton, William B. Euler, Brian M Hoffman

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35 Scopus citations


The complexes [Et4N]3[Fe(MS4)2] (M = Mo, W) have been prepared by reaction of [Et4N]2MS4 with Fe(S2CNC5H5)2 in CH2Cl2 and routinely characterized by infrared and visible spectroscopy. Cyclic voltammetry studies show that, for M = Mo, only the 3-/4- couple is reversible but that, for M = W, reversible 1-/2-, 2-/3-, and 3-/4- couples are observed. The complexes exhibit magnetic moments consistent with the presence of three unpaired electrons, prompting low-temperature electron paramagnetic resonance studies. Signals that are consistent with an S = 3/2 spin state are observed in a variety of solvents for both M = Mo and M = W, and the absence of high-field resonances is indicative of a relatively high value for the zero-field splitting parameter. Values of λ = E/D are estimated for all systems. The potential significance of the similarity of the EPR spectra of these complexes to those of the molybdenum-iron protein of nitrogenase and its cofactor is discussed.

Original languageEnglish (US)
Pages (from-to)2202-2208
Number of pages7
JournalInorganic Chemistry
Issue number15
StatePublished - Jan 1 1983

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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