Synthesis and structure of a pure inorganic polyoxo-metalate-based porous framework

A pure inorganic porous framework based on the tungstoferrate FeW12O40]5−, Fe(H2O)6HNa6FeW12O40]2•44H2O (1) was obtained by the conventional aqueous solution method and characterized by elemental analysis, TG, FT-IR, UV-vis spectroscopy. Single-crystal X-ray diffraction analyses reveal that compound 1 crystallizes in the space group Fm-3m, which is composed of a porous inorganic framework Na6FeW12O40]n with two kinds of pores A and B, accommodating Fe(H2O)6 units in pore A, which was observed rarely in the pure inorganic framework.