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Nature Chemistry (16 January 2009) | doi:10.1038/nchem.114

High-spin complexes: Ironed straight

Neil Withers

Open-shell transition metal ions — those without a full d-shell of electrons — with only two coordinating ligands have interesting reaction chemistry and properties. Although some examples of two-coordinate iron complexes are known, most increase the amount of coordination on the metal centre through interactions to remote parts of the ligands.