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)V2O6]

The hydrothermal reaction of CuSO4.5H(2)O, Na3VO4, methylphosphonic acid, 2,2'- bipyridine, and H2O in the mole ratio 1.22: 1.30 : 3.63 : 1.00 : 2250 at 150degreesC for 43 h yielded beta-[ 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)O-3} 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 200degreesC for 67.5 h yielded beta-[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.