Synthesis and structure determination of MIL-10:: A monodimensional metallodiphosphonate formulated MIVO{O3P-CH2-PO3}(NH4)2 (M = Ti, V)

In the view of synthesizing microporous composite compounds, the ternary systems NH4VO3: alkyldiphosphonic acid:H2O were hydrothermally investigated. Using the methylendiphosphonic acid, the mixture corresponding to the molar ratio 1:0.3:500 heated three days at 200 degrees C, leads to small platelets whose structure was determined by single crystal X-ray diffraction. Their symmetry is orthorhombic (space group Pnma (n degrees 62)) with lattice parameters : a = 7.3182(1) Angstrom, b = 16.5633(1) Angstrom, c = 7.5225(2) Angstrom, V = 911.83(4) Angstrom(3), Z = 4. The compound labelled MIL-10, is formulated (VO)-O-IV{O3P-CH2-PO3}(NH4)(2), and shows a monodimensional structure characterized by the presence of polyhedral chains between which ammonium cations are located. The isostructural titanium compound was also hydrothermally synthesized. Its structure was solved from single crystal data; its symmetry is orthorhombic (space group Cmcm (n degrees 63)) with lattice parameters: a = 16.462(1) Angstrom, b = 7.7671(6) Angstrom, c = 7.2830(6) Angstrom, V = 931.2(1) Angstrom(3), Z = 4. (C) Academie des sciences/Elsevier, Paris.