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Synthesis and characterization of tungsten trioxide powders prepared from tungs...
Nogueira, HIS; Cavaleiro, AMV; Rocha, J; Trindade, T; Jesus, JDP deWO3 powders were prepared by the thermal decomposition of tungstic acids (WO3 nH2O, n ¼ 1/3, 1, 2). The tungstic acids were synthesized from WO4 2 aqueous solutions under a variety of conditions of pH, temperature and W(VI) concentrations. The thermal decomposition of the tungstic acids into WO3 was analysed by TG and DSC methods. Nano-sized WO3 powders with different morphological characteristics were obtaine...
A novel supramolecular organic-inorganic adduct containing alpha-Keggin-type [P...
Paz, FAA; Sousa, FL; Soares-Santos, PCR; Cavaleiro, AMV; Nogueira, HIS; Klinowski, J; Trindade, TThe structure of the title compound, tris(hydroxonium) 12- phosphato-tetracosa- 2-oxo-dodecaoxododecatungsten hexakis( benzo-15-crown-5)±methanol±water (1/1/1), (H3O)3- [PW12O40] 6C14H20O5 CH3OH H2O (where C14H20O5 is benzo-15-crown-5), has been determined at 180 K. [PW12O40]3ÿ anions are typical of -Keggin structures, and the [H3O (C14H20O5)2]+ sandwich-type moieties contain a large number of short O O c...
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