Acta Cryst. (2008). E64, m672  [ doi:10.1107/S1600536808009896 ]

Tris[tris(1,10-phenanthroline-²N,N')iron(II)] dodecatungstoferrate dihydrate

F.-X. Ma, Y.-G. Chen and D.-M. Shi

Abstract: The title compound, [Fe(C₁₂H₈N₂)₃]₃[FeW₁₂O₄₀]·2H₂O, was prepared under hydrothermal conditions. The discrete Keggin-type [FeW₁₂O₄₀]^6- heteropolyoxoanion has threefold symmetry, with the Fe^II atom located on the threefold rotation axis. The central FeO₄ tetrahedron in the anion shares its O atoms with four W₃O₁₃ trinuclear units, each of which is made up of three edge-shared WO₆ octahedral units. The Fe^II atom in the complex cation, viz [Fe(phen)₃]²⁺ (phen is 1,10-phenanthroline), shows a slightly distorted octahedral geometry defined by six N atoms from three phen ligands. The polyoxoanions pack together with the cations, with the disordered water molecules located in voids; the site occupancy factor for each water O atom is 0.33.

Online 16 April 2008

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