Hydrothermal syntheses and structures of two new hybrid vanadium arsenates: (2,2′-bpy)2(VVO2)2(AsO4)⋠H3O⋠H2O and (2,2′-bpy)2V4O7(HAsO4)2

Two new hybrid vanadium arsenates (2,2′-bpy)2(VVO2)2(AsO4)⋅H3O⋅H2O 1 and (2,2′-bpy)2V4O7(HAsO4)22 (2,2′-bpy = 2,2′-bipyridine) were synthesized under hydrothermal reaction conditions and structurally characterized by single-crystal X-ray diffraction, thermogravimetric analysis (TGA), IR, powder XRD and elemental analyses. Crystal data for 1: monoclinic, C2/c, a=13.867(7)Å, b=22.351(10)Å, c=9.252(4)Å, β=103.857(4)°, V=2784(2)Å3, Z=4. Crystal data for 2: triclinic, P-1, a=8.4401(1)Å, b=9.3309(11)Å, c=9.6996(10)Å, α=96.910(4)°, β=110.860(2)°, γ=98.595(4)°, V=693.23(11)Å3, Z=1. Compound 1 is composed of discrete {(VO2)2(AsO4)} 3-membered rings bonded to two 2,2′-bpy ligands. Compound 2 exhibits a 2D arsenic vanadate network decorated with 2,2′-bpy ligands.