Synthesis And Characterization Of Inorganic-Organic Hybrid Materials Of Molybdenum Oxide Array

Polyoxometalates (POMs) have recently been attracting extensive interest in solid state materials chemistry due to their fascinating properties and great potential applications in many fields such as catalysis, material science, medicine, and magnetochemistry. Polyoxometalates (POMs) as one kind of significant metal oxide clusters with nanosizes and abundant topologies have recently been employed as inorganic building blocks for the construction of new materials. In particular, the chemistry of coordination compounds of polyoxometalates with organic ligands provides knowledge about the interaction of small organic molecules with polyoxometalates surface.In this paper, we have devoted effort toward conventional aqueous solution synthesis of organic–inorganic hybrids based on polymolybdates. Eight novel organic–inorganic hybrids based on polymolybdates were conventional aquous synthesized and characterized by using X?ray single–crystal diffraction, IR spectroscopy and thermogravimetric analysis. Four kinds of orangic ligand, such as GLY, NMP, DMF and imidazole, were used in the synthesis of inorganic–organic hybrids based on polymolybdates. In the structure of these compounds, organoamines may play a variety of roles in these inorganic–organic hybrid materials: 1) charge–compensating cations, 2) ligands bonded directly to a molybdenum site of the molybdenum oxide skeletal backbone, and 3) ligands bonded to the heterometal site. The chemical constitution formulas arelisted as follows: (1) [Himi]4[Co(imi)2(H2O)2Mo7O24]?4H2O (2) [Himi]2[Ni(imi)3(H2O)][Ni(OH)6Mo6O18]?2H2O (3) [Ba(NMP)3(H2O)][Mo4O13] (4) [NH4][Ce(DMF)7(Mo8O26)] (5) [Zn(imi)4]2[(imi)2Mo8O26]?6H2O (6) [NH4][Y(DMF)5(H2O)3][Mo8O26]?2CH3CN (7) Mg2[(Gly)2Mo8O26]?4H2O (8) [Himi]4[(DMF)2Mo8O26] The single?crystal X?ray diffraction analysis shows that the compounds (1)⁴ of organoamines are as ligands bonded to the heterometal site. Compound (5),(7) and (8) of organoamines are as ligands bonded directly to a molybdenum site of the molybdenum oxide skeletal backbone. Compound (6) of ligand bonded to the heterometal site forming charge–compensating cations.