A novel two-dimensional inorganic-organic composite solid material of iron(III) molybdate [enH(2)][Fe-2(MoO4)41 (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 {FEo(6)} 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 {MOo(4)} tetrahedral units which interconnect the diiron core through the corner sharing, leading to a novel two-dimensional framework.