Acta Cryst. (2009). E65, m505-m506  [ doi:10.1107/S160053680901294X ]

Poly[[2-(3-pyridinio)-1H,3H⁺-benzimidazolium] [₄-oxido-di-₃-oxido-tetra-₂-oxido-hexaoxidotetramolybdenum(VI)]]

L.-J. Chen, S. Lin, X.-Y. Wu and X.-H. Chen

Abstract: The reaction of MoO₃ with 2-(3-pyridyl)benzoimidazole and water in the presence of MnSO₄·5H₂O at 453 K under hydrothermal conditions afforded the title compound, {(C₁₂H₁₁N₂)[Mo₄O₁₃]}_n, in which infinite molybdenum oxide anionic chains are charge-balanced by diprotonated 2-(3-pyridyl)benzoimidazole (H₂3-PBIM²⁺) cations. Eight [MoO₆] octahedra are edge-shared, forming compact octamolybdate subunits which are connected through pairs of Mo-O-Mo bridges into extended one-dimensional arrays propagating along the a-axis direction. The asymmetric unit of the metal oxide chain contains one half of the octamolybdate unit, denoted [Mo₄O₁₃], the other half being generated by an inversion center. These molybdenum oxide chains are further connected through the 2-(3-pyridinio)benzoimidazolium cations into a three-dimensional network via N-HO hydrogen bonds. In addition, neighbouring diprotonated cations are arranged in a head-to-tail fashion with a plane-to-plane separation of 3.63 (10) Å, indicating the existence of weak aromatic - stacking interactions.

Online 10 April 2009

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