Solid state coordination chemistry of oxovanadates: Hydrothermal syntheses and structures of two novel copper vanadate ribbons, β-[Cu(2,2′-bipyridine)V₂O₆] and β-[Cu(2,2′:6′,2″-terpyridine)V₂O ₆]

The hydrothermal reaction of CuSO₄·5H₂O, Na₃VO₄, methylphosphonic acid, 2,2′-bipyridine, and H₂O in the mole ratio 1.22:1.30:3.63:1.00: 2250 at 150°C for 43 h yielded β-[Cu(bpy)V₂O₆] (1). The structure of 1 is a one-dimensional ribbon constructed of {V₆O₁₈}^6- clusters linked by a binuclear subunit of edge sharing {Cu(bpy)O₃} square pyramids. Similarly, the reaction of Cu₂O, Na₃VO₄, 2,2′:6′,2″-terpyridine, selenous acid, and water, in a mole ratio 1.52:1.00:2.02:9.31:2130 at 200°C for 67.5 h yielded β-[Cu(tpy)V₂O₆] (2). The structure of 2 is comprised of an undulating chain of corner sharing vanadium oxide tetrahedra, with {Cu(tpy)}²⁺ subunits spanning the adjacent crests and troughs.