Polyoxometalate (POM) chemistry has attracted intense interest because of its fascinating structures and potential applications, such as high-density optical storage media, sensors, catalysis and biomedicine. They may self-assemble into one-, two-, and three-dimensional structures. However, it is still a challenging task in POM chemistry to assemble discrete polyanion units into one- or two-dimensional extended solid frameworks in appropriate ways. In our work we determined the structure of two molybdate hydrates, CoMo₃O₁₀· nH2O (I) and CuMo₂O₁₂· nH₂O (II). These compounds were synthezied by reaction between hot solution of CoCO₃ or CuCO₃ and suspension of MoO₃. Obtained fiber crystals were grinded with mother solution and measured using focusing mirror in capillary geometry.

Figure 1. The unit cell of compound II.

Crystal structures of both compounds were solved using global optimization method (FOX [1]) and refined by Rietveld method (Jana2000 [2]). Compound I crystallizes in monoclinic system in the space group P 2₁/c with: a = 12.0698 (8) Å, b = 19.825(1) Å, c = 7.6213(8) Å, α = 90°, β = 107.584(7)°, γ = 90°, V = 1738.5(1) ų. Compound II (fig.1) crystallizes in triclinic system in the space group P -1 with: a = 8.6800 (9) Å, b = 9.2894(8) Å, c = 6.0643(8) Å, α = 90.72(1)°, β = 96.00(1)°, γ = 97.43(2)°, V = 482.06(7) ų.

Literature:
1. Favre-Nicolin V., Cerny R., J. Appl. Cryst. 35 (2002) 734
2. Petricek V., Dusek M. & Palatinus L.(2000). Jana2000. Institute of Physics, Praha, Czech Republic

Supported by the Polish MEiN grant 1T09A 07730.

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