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

Abstract A new bi-dentate decavanadate compound formulated [Cu(en) 2 H 2 O] 2 [H 2 V 10 O 28 ]·12H 2 O (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) A, b  = 13.4690(6) A, c  = 15.2084(7) A, α  = 102.8150(1)°, β  = 91.2380(1)°, γ  = 92.1010(1)°, V  = 2047.12(2) A 3 , R 1 ( I  > 2 σ ( 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) 2 H 2 O] 2+ complexes and free water molecules. Furthermore, a three-dimensional (3D) framework is achieved in 1 via hydrogen bonds between O/N atoms and H atoms of the neighboring [Cu(en) 2 H 2 O] 2 [H 2 V 10 O 28 ] subunits. The UV–vis spectrum, fluorescent and electrochemical properties of 1 in aqueous solution are also studied.