Synthesis and Crystal Structure of a New Vanadyl Phosphate [H 0.6 (VO) 3 (PO 4 ) 3 (H 2 O) 3 ]·4H 2 O and Its Conversion to Porous Products

Chemistry of Materials (Impact Factor: 8.54). 07/2001; 13(7):2288-2296. DOI: 10.1021/cm0008821
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    ChemInform 01/2010; 32(42).
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    ABSTRACT: Highly porous vanadium phosphorus oxides (V–P oxides) of high specific surface area were synthesized by thermal treatment of layered vanadyl n-butylphosphate in N2. The surface area of V–P oxides was greatly increased by thermal treatment within a temperature range of 500–550 K, and reached 225 m2g−1 after treatment at 568 K. The N2 adsorption–desorption isotherm of V–P oxide is a Type IV isotherm, indicating that this material is mesoporous. Micropore and mesopore size distributions were determined from Saito–Foley analysis using an Ar adsorption isotherm and Dollimore–Heal analysis using an N2 desorption isotherm, respectively. The pores show a bimodal distribution in the micropore and mesopore region, and the micropores show a broad distribution with small volume (0.004 cm3g−1). The mesopores, which have a size of 4.4 nm and a volume of 0.272 cm3g−1, were probably formed from fractures of microcrystallites along layers of vanadyl n-butylphosphate.
    Microporous and Mesoporous Materials 07/2002; 54(3):277-283. · 3.21 Impact Factor
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    ABSTRACT: A new compound—the first titanium vanadyl(V) phosphate Cs2[Ti(VO2)3(PO4)3]—has been obtained under hydrothermal conditions. Its crystal structure was determined by single crystal X-ray diffraction: space group P6ccP6cc, Z=4Z=4, a=13.765(1)a=13.765(1), c=9.4753(7) Åc=9.4753(7) Å at 293 K, wR2=0.068wR2=0.068, R=0.030R=0.030. In the structure [VO5] polyhedra form six-membered rings by sharing vertices. Each two neighboring V polyhedra in the ring are additionally bridged by [PO4] tetrahedra. All vanadyl groups (O6) remain terminal and are pointing toward the c-direction giving rise to a strongly polar structure. Ti octahedra link these V, P rings by sharing all six vertices with P tetrahedra under formation of a three-dimensional anionic framework [Ti(VO2)3(PO4)3]2−∞∞∞. Intersecting channels in the [001], [100], [010], and [110] directions, containing the Cs cations suggest to consider the new compound as a possible 3D ion-conductor. Topological relations between this new structure and the mineral benitoit BaTiSi3O9 are discussed.
    ChemInform 04/2006;