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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...
Lanthanide compounds containing a benzo-15-crown-5 derivatised [60]fullerene an...
Soares-Santos, PCR; Trindade, T; Tome, AC; Rocha, J; Ferreira, RAS; Carlos, LD; Paz, FAA; Klinowski, J; Nogueira, HISNovel lanthanum(III), europium(III) and terbium(III) compounds of a benzo-15-crown-5 [60]fulleropyrrolidine were isolated in the solid state and characterised using vibrational (infrared and Raman) spectroscopy and by 13C CP MAS NMR for the lanthanum(III) compound. The photoluminescence properties were investigated for the europium(III) and terbium(III) compounds. The related [Tb(H2O)3(NO3)2(acac)] C14H20O5 [...
Novel lanthanide luminescent materials based on complexes of 3-hydroxypicolinic...
Soares-Santos, PCR; Nogueira, HIS; Felix, V; Drew, MGB; Ferreira, RAS; Carlos, LD; Trindade, TNew lanthanide complexes of 3-hydroxypicolinic acid (HpicOH) were prepared: [Ln(H2O)- (picOH)2(í-HpicO)]â3H2O (Ln ) Eu, Tb, Er). The complexes were characterized using photoluminescence, infrared, Raman, and 1H NMR spectroscopy, and elemental analysis. The crystal structure of [Eu(H2O)(picOH)2(í-HpicO)]â3H2O 1 was determined by X-ray diffraction. Compound 1 crystallizes in a monoclinic system with space group P...
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