Abstract
Temperature dependent Mössbauer studies of two ferrocenecarboxylate functionalized {Fe3O} complexes in solid state are reported. It was found that conjugation of ferrocene ring orbitals with the π orbitals of the adjacent carboxylic group promotes a shift of electron density from the ferrocene FeII ion to the cyclopentadienide rings with π-orbital character giving rise to a new type of mixed-valence compound.
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