Reduction with CaH2 of double-layered perovskite Sr3Fe2O7 yielded novel two-legged S=2 ladder compound Sr3Fe2O5. Together with the synthesis of SrFeO2, this opens up new avenues for solid-state chemistry and physics of a series of n-legged ladders Srn+1FenO2n+1. The picture illustrates the structural transformation from FeO6 octahedra in Sr3Fe2O7 to FeO4 squares in Sr3Fe2O5, which occurs via intermediate Sr3Fe2O6 (Sr blue, O red, Fe yellow).
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Kageyama et al. (2008) studied this question.
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