Abstract

In this paper, we briefly summarize the main conclusions of the Mossbauer 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 Mossbauer spectroscopy. The magnetic Mossbauer spectra imply a system spinSt=9/2 for the dimer in its ground state. The values for hyperfine and spin-Hamiltonian parameters, obtained from simulations of the Mossbauer spectra, are δ=0.74 mms−1, ΔEQ=−2.14 mms−1,A⊥=−10.6 T,A∥=−13.5 T andD=1.8 cm−1. The system spinSt=9/2 is interpreted to be a consequence of double-exchange coupling.

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