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  • 1
    Electronic Resource
    Electronic Resource
    Mössbauer study of a novel binuclear Fe(II/III) delocalized-valence compound (1990)
    Springer
    Hyperfine interactions 53 (1990), S. 311-315 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we briefly summarize the main conclusions of the Mössbauer analysis of [L2Fe2(μ-OH)3] (ClO4)2·2CH3OH·2H2O with L=N,N',N"-trimethyl-1,4,7-triazacyclononane, a novel dimeric iron compound, which possesses a central exchange-coupled delocalized-valence Fe(II/III) unit. The complete delocalization of the excess electron in the dimeric iron center is concluded from the indistinguishability of the two iron sites in Mössbauer spectroscopy. The magnetic Mössbauer spectra imply a system spinS t=9/2 for the dimer in its ground state. The values for hyperfine and spin-Hamiltonian parameters, obtained from simulations of the Mössbauer spectra, are δ=0.74 mms−1, ΔE Q=−2.14 mms−1,A ⊥=−10.6 T,A ∥=−13.5 T andD=1.8 cm−1. The system spinS t=9/2 is interpreted to be a consequence of double-exchange coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101058
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  • 2
    Electronic Resource
    Electronic Resource
    Exchange interaction in trinuclear transition-metal complexes (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 229-232 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Heterotrinuclear transition-metal complexes are of interest for the study of long-range magnetic interactions and as model compounds for the investigation of biological electron transport chains. The systems under study here contain paramagnetic Fe111-containing terminal units and a bridging unit with M11=Zn, Cu, Ni, Co, Fe, Mn. The spectroscopic methods applied include Mössbauer, — EPR- and magnetic susceptibility investigations. The spin-Hamiltonian analysis of the measured results yields information about the intramolecular super-exchange interactions among the various magnetic transmition-metal sites. In view of the 7Å separation between the two terminal Fe111 sites, the Fe111...Fe111 exchange coupling of the order −10cm−1 is large.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396478
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