In the title compound, (C(14)H(16)N(4))(2)[Mo(8)O(26)], the β-octa-molybdate anion is centrosymmetric. N-H⋯O hydrogen bonds link the diimidazolium cations and the polyoxidoanions into a chain structure along [100]. π-π inter-actions between the imidazole rings and between the imidazole and benzene rings [centroid-centroid distances = 3.611 (2) and 3.689 (3) Å, respectively] connect the chains.
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