Abstract
The title compound, (C10H10N2)2[Mo8O26], was produced by hydrothermal reaction of an acidified aqueous solution of H2MoO4, 4,4′-bipyridine and NiCl2·6H2O. The structure of the title compound consists of the β-octamolybdate anion having a center of symmetry and protonated 4,4′-bipyridine cations. The distances between Mo and O atoms shared by two or more neighboring {MoO6} octahedra are in the range 1.750 (2)–2.450 (2) Å and those between Mo and terminal O atoms in the range 1.696 (3)–1.720 (3) Å. The N—H⋯O hydrogen-bond lengths are in the range 2.722 (4)-2.755 (4) Å.
