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X–ray diffraction studies of transition metal molybdates

Bartłomiej A. Gaweł 2Wiesław Surga 3Wieslaw Lasocha 1,2

1. Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, Niezapominajek 8, Kraków 30-239, Poland
2. Jagiellonian University, Faculty of Chemistry, Ingardena 3, Kraków 30-060, Poland
3. Świętokszyska Academy, Institute of Chemistry, Chęcińska 5, Kielce 25-020, Poland

Abstract

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) Å3. 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) Å3.

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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Related papers

Presentation: Poster at 11th European Powder Diffraction Conference, Poster session, by Bartłomiej A. Gaweł
See On-line Journal of 11th European Powder Diffraction Conference

Submitted: 2008-04-30 15:39
Revised:   2009-06-07 00:48