Abstract
Oxo-centered trinuclear mixed-valence iron fumarate [Fe3O(O2CCH=CHCO2)3(H2O)3]·nH2O and iron malonate [Fe3O(O2CCH2CO2)3(H2O)3] have been prepared and studied by variable temperature Mossbauer spectroscopy. Iron fumarate complex showed a temperature dependent valence delocalization process. At 6 K two quadrupole split doublets corresponding to high-spin Fe(III) and high-spin Fe(II) state with an area ratio of 2:1 were observed and at 298 K there was only an averaged singlet peak. On the other hand malonate complex showed a localized valence state of high-spin Fe(III) and Fe(II) from low temperature to room temperature only with a slight variation in area ratio and spectral line broadening for Fe(II).
Published Version
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