title: Bis[1,1'-(1,3-phenyl-enedimethyl-ene)di(1H-imidazol-3-ium)] β-octa-molybdate.
abstract: 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.
authors.affiliation: Engineering Research Center of Pesticides of Heilongjiang University, Heilongjiang University, Harbin 150050, People's Republic of China, and College of Chemistry and Materials Science, Heilongjiang University, Harbin 150080,  People's Republic of China.
authors.forename: Xiao-Dan
authors.initials: XD
authors.lastname: Wang
authors.forename: Guang-Feng
authors.initials: GF
authors.lastname: Hou
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Yu
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: Gao