catena-Poly[bis­(μ-2,2′-bipyridin-6-ol­ato)-κ³N,N′:O;O:N,N′-dicopper(I,II) [[tetra­fluorido­niobium(V)]-μ-oxido]]

The structural unit consists of one C₂-symmetric [NbOF₄]⁻ anion, where the Nb^V centre is five-coordinated by four F atoms and one O atom in the first coordination shell, forming a square-pyramidal coordination geometry, and of one centrosymmetric coordinated [Cu₂(obpy)₂]⁺ cation (obpy is 2,2′-bipyridin-6-olate), in which the oxidation state of each Cu site is disordered, which is confirmed by XPS results.