SEARCH Articles Figures Tables A Mixed-Valence Heptanuclear Iron Complex High valence iron compounds Iron complexes 18 valence electron rule Iron complexes 19 valence electrons Iron mixed valence compounds Iron porphyrins valence electronics Iron-sulfur proteins valence delocalization Iron-sulfur proteins, valence Iron-sulfur proteins, valence electrons Mixed-valence iron pairs Spin and Valence States of Iron in Silicate Perovskite Spin and Valence States of Iron in Silicate Postperovskite Valence electron counts, iron clusters Valence of iron