A new hybrid Dawson-type molybdenum arsenate derivative: (H2bpy)3[As2Mo18O62] (bpy = 4,4′-bipyridine)

The title compound, tris(4,4′-bipyridinium) diarsenooctadecamolybdate(VI), (C10H10N2)3[As2Mo18O62], featuring protonated bipyridine molecules and a classical Dawson-type polyoxo-anion, has been synthesized under hydrothermal conditions. The polyoxoanions are linked together via the bipyridyl cations, acting as hydrogen-bond donors, generating a two-dimensional supramolecular network. The asymmetric unit contains 1.5 4,4′-bipyridinium (H2bpy) units, with an inversion centre in the central bond of the second H2bpy unit. The site symmetry of the anion is overline{1}