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Synthesis, structure, and spectroscopy of an oxodiiron(II) complex.

Bridging oxo species are important in the synthetic and biological chemistry of iron, and are found with iron oxidation states from +2 to +4. We report the first oxodiiron(II) complex that has been crystallographically characterized. It has been examined by NMR, IR, and Mössbauer spectroscopies as well as density-functional calculations.