Abstract: A novel inorganic/organic hybrid compound Co(μ2-bpy)V2O6 was synthesized by hydrothermal reaction of CoCl2•6H2O, 4,4′-bipyridine,NH4VO3,and H2O in a molar ratio of 1∶2∶2∶1950 at 170 ℃ for 72 h. The compound crystallized in triclinic space group Pī,with the cell parameters a=0.81599(7) nm, b=0.85826(7) nm, c=1.02031(8) nm, α=87.111(2)°, β=75.305(2)° and γ=74.782(2). As showed by single crystal X-ray diffraction, The crystal structure is constructed with inorganic bimetallic oxide layers, [Co2V4O12]n, and organic 4,4′-bipyridine μ2-ligands.The 4,4′-bipyridine ligands bridge the inorganic layers through N－Co coordination bonds to build up a three dimensional covalent framework with various open micropores. UV-Vis-NIR reflectance spectrum study revealed the nature of a semiconductor with an energy gap of ca.2.0 eV and thermal analysis showed thermal stability below 420 ℃ for the title compound.

Key words: Co(μ₂-bpy)V₂O₆, Hydrothermal synthesis, Crystal structure, Thermal stability, Diffuse reflectance spectra