[en] A novel two-dimensional inorganic-organic composite solid material of iron(III) molybdate [enH₂][Fe₂(MoO₄)₄] (1) (en=ethylenediamine) has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectra, and X-ray diffraction analysis. The sheet structure is constructed by binuclear {FeO₆} octahedra and bridging {MoO₄} tetrahedra. The two iron octahedra are edge-shared, and all of the oxygen atoms in iron coordination spheres are provided from the {MoO₄} tetrahedral units which interconnect the diiron core through the corner sharing, leading to a novel two-dimensional framework. (author)