Synthesis, crystal structure and properties of a new bi-dentate decavanadate [Cu(en)2H2O]2[H2V10O28]·12H2O

A new bi-dentate decavanadate compound formulated [Cu(en)2H2O]2[H2V10O28]·12H2O (en = ethylenediamine) (1) has been hydrothermally synthesized and structurally characterized. And 1 crystallizes in the triclinic, space group P-1 with a = 10.2606(5) Å, b = 13.4690(6) Å, c = 15.2084(7) Å, α = 102.8150(1)°, β = 91.2380(1)°, γ = 92.1010(1)°, V = 2047.12(2) Å3, R1(I > 2σ(I) = 0.0511), and Z = 2. X-ray diffraction analysis reveals that 1 is constructed from bi-dentate decavanadate formed by decavanadate clusters coordinated to [Cu(en)2H2O]2+ complexes and free water molecules. Furthermore, a three-dimensional (3D) framework is achieved in 1via hydrogen bonds between O/N atoms and H atoms of the neighboring [Cu(en)2H2O]2[H2V10O28] subunits. The UV–vis spectrum, fluorescent and electrochemical properties of 1 in aqueous solution are also studied.

Structure view showing 2D layers in 1. All the hydrogen atoms and water molecules are omitted for clarity.Figure optionsDownload as PowerPoint slide