Acta Cryst. (2005). E61, m711-m713  [ doi:10.1107/S1600536805008044 ]

Tetrakis(1,4-dimethylpyridinium) dodecamolybdophosphate nitrate

X.-J. Tan, S.-X. Sun, J.-P. Ma, S.-L. Liu and D.-X. Xing

Abstract: In the title compound, (C₇H₁₀N)₄[PMo₁₂O₄₀]NO₃, the asymmetric unit contains two 1,4-dimethylpyridinium (DMP) cations, one half of a nitrate anion perpendicular to the mirror plane and one half of a dodecamolybdophosphate (PMo₁₂) anion. Because of orientational disorder, a crystallographic centre of symmetry appears at the central P atom of the PMo₁₂ anion, although the PO₄ moiety has a tetrahedral structure and does not have a centre of symmetry. The PMo₁₂ anions show a disordered `pseudo-Keggin' structure and they are linked into an infinite three-dimensional assembly by DMP cations, via electrostatic forces and C-HO interactions.

Online 25 March 2005

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