Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 6 (June 2013)

metal-organic compounds

Acta Cryst. (2013). C69, 588-593    [ doi:10.1107/S0108270113011554 ]

Two polyoxometallate-based supra­molecular compounds influenced by the ratio between the polyoxometallate anion and organic cation

Q. Zhang, J. Liu, J. Lu and S.-W. Gong

Abstract: Two polyoxometallate-based compounds, tris­[1,1'-(butane-1,4-di­yl)bis­(1H-imidazol-3-ium)] bis­[tetra­cosa-[mu]2-oxido-do­deca­­oxido-[mu]12-phosphato-dodeca­molybdenum(VI)], (C10H16N4)3[PMo12O40]2, (I), and 1,1'-(butane-1,4-di­yl)bis­(1H-imid­azol-3-ium) 1-[4-(1H-imidazol-1-yl)but­yl]-1H-imidazol-3-ium tetra­cosa-[mu]2-oxido-dodeca­oxido-[mu]12-phosphato-dodeca­molyb­denum(VI) dihydrate, (C10H16N4)(C10H15N4)[PMo12O40]·2H2O, (II), were synthesized by hydro­thermal techniques at different pH values. The stoichiometric ratio between the polyoxometallate (POM) anions and organic cations is 2:3 in (I), with one of the cations lying on an inversion centre. The doubly protonated 1,1'-(butane-1,4-di­yl)di­imidazole (BIM) cations are linked to the [PMo12O40]3- anions by hydrogen bonds to form a three-dimensional supra­molecular network. The stoichiometric ratio of POM anions and organic cations is 1:2 in (II), and the anion is located about a centre of inversion. The partly protonated BIM cations and solvent water mol­ecules form hydrogen bonds with the [PMo12O40]3- anions, yielding a two-dimensional supra­molecular layer. The different lattice architectures of (I) and (II) may be governed by the ratio between the POM anions and organic cations, which, in turn, is determined by the pH value.

Formula: (C10H16N4)3[PMo12O40]2 and (C10H16N4)(C10H15N4)[PMo12O40]·2H2O

hkldisplay filedownload file

Structure factor file (CIF format) (381.9 kbytes)
[ doi:10.1107/S0108270113011554/yf3031Isup2.hkl ]
Contains datablock I

hkldisplay filedownload file

Structure factor file (CIF format) (224.7 kbytes)
[ doi:10.1107/S0108270113011554/yf3031IIsup3.hkl ]
Contains datablock II


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