Two New Inorganic-organic Hybrid Compounds Constructed from Different Polymolybdates and Transition Metal-amine Subunits

Two new polyoxometalate(POM)-based hybrid compounds, Cu(en)]H₄Mo₄O₁₆]_0.5(1)(en=ethylene- diamine) and Ag(3-C₅H₆N₂)₂]H₂PMo₁₂O₄₀](2)(3-C₅H₆N₂=3-aminopyridine), containing different transition metal-amine subunits were hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy and single-crystal X^-ray diffraction. For compound 1, each H₄Mo₄O₁₆]^4-(Mo₄O₁₆) cluster was linked to four neighboring Mo₄O₁₆ clusters through four Cu(en)]²⁺ subunits to yield a (2,4)-connected 2D layer, which was further extended to a 3D supramolecular network via hydrogen bonding interactions. For compound 2, the adjacent H₂PMo₁₂O₄₀]^- clusters were bridged by Ag(3-C₅H₆N₂)₂]⁺ subunits to generate a 1D chain. The electrochemical behaviors and the photocatalytic activities of compounds 1 and 2 were studied in detail.