Trinuclear Mixed-Valent Oxo-Centered Iron Complexes: Fully Localised, Partially and Fully Delocalised Valencies - Saalfrank, Rolf; Scheurer, Andreas; Schünemann, Volker; Trautwein, A. X. (Mössbauer Spectroscopy and Transition Metal Chemistry - Fundamentals and Applications, 2011)