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Corner-sharing, edge-sharing, and face-sharing FeOx polyhedra (x = 5,6) form a cyclic complex anion in K5[OFe6{(ino)621H}]·14.5 H2O (ino = cis-inositol), the first structurally characterized polyolato(oxo)ferrate from aqueous solution. The synthesis is as simple as the structure is complicated (see diagram).
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Hegetschweiler et al. (1995) studied this question.
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