Poly[nickel(II)-di-μ-4,4′-bipyridyl-κ⁴N: N′-μ-dichromato-κ²O:O′] and poly[copper(II)-di- μ-4,4′-bipyridyl-κ⁴N:N′-μ-dichromato- κ²O:O′]

The novel title hybrid isomorphous organic-inorganic mixed-metal dichromates, [Ni(Cr₂O₇)(C₁₀H₈N ₂)₂] and [Cu-(Cr₂O₇)(C ₁₀H₈N₂)₂], have been synthesized. A non-centro-symmetric three-dimensional (4,6)-net is formed from a linear chain of vertex-linked [Cr₂O₇]^2- and [MN ₄O₂]²⁺ (M = Ni and Cu) units, which in turn are linked by the planar bidentate 4,4′-bipyridine ligand through the four remaining vertices of the [MN₄O₂]²⁺ octahedra. There are two such three-dimensional nets that interpenetrate with inversion symmetry.