The infra-red spectra of inorganic phosphorus compounds. Part II. Some salts of phosphorus oxy-acids
About: This article is published in Journal of The Chemical Society (resumed).The article was published on 1954-01-01. It has received 122 citations till now. The article focuses on the topics: Phosphorus.
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TL;DR: In this article, the authors investigated the reactivity of anhydrous H3PO4 with different tetraalkoxysilanes (Si(OR)4, R = Me, Et, iPr, nBu) in a 1:1 molar ratio in diethylether at room temperature and normal pressure.
Abstract: Reactions of anhydrous H3PO4 with different tetraalkoxysilanes (Si(OR)4, R = Me, Et, iPr, nBu) in a 1:1 molar ratio in diethylether at room temperature and normal pressure generate silicophosphates (SiPOs). Solid state 29Si NMR investigations clearly indicate that the precipitates contain large amounts of SiO6-species. The substructures of the products are strongly influenced by the alkyl substituents R of the tetraalkoxysilanes, as further supported by 31P MAS, 13C CP/MAS NMR and FTIR spectroscopy. All solid products are amorphous containing P:Si-ratios of 1.2–1.7, which was proved by powder XRD and elemental analysis. Since small amounts of water may be formed in the H3PO4–Si(OR)4-systems upon condensation and esterification reactions (which results in reaction mixtures being not completely anhydrous), the reactivity of P4O10 towards tetraethoxysilane was investigated at room temperature confirming the formation of SiO6-units as well.
20 citations
TL;DR: In this article, the optical band gaps have been deduced from spectral dependence curves and the infrared spectra of these investigated glasses were found analogous to SrO-Fe2O3-P2O5.
Abstract: Zinc molybdenum phosphate (ZnO–MoO3–P2O5) glasses of different compositions were prepared and synthesized and some of their properties were studied. The optical band gaps have been deduced from spectral dependence curves. The infrared absorption spectra of these investigated glasses were found analogous to SrO–Fe2O3–P2O5. Annealing at different temperatures does not show a prominent change in absorption band positions. We correlate our findings with a possible structural explanation of these glasses.
19 citations
TL;DR: The Raman and infra-red spectra of H3CSO3H and some of its salts have been obtained, with Raman polarization data for the acid as discussed by the authors.
Abstract: The Raman and infra-red spectra of H3CSO3H and some of its salts have been obtained, with Raman polarization data for the acid.
An interpretation of the spectra is given and force constants have been calculated.
19 citations
TL;DR: In this paper, a fungal cellulase enzyme was applied to improve the selective separation of apatite from hematite during the reverse anionic flotation of a high-phosphorus iron ore.
18 citations
TL;DR: In this article, a mixture of rare earth oxide (Nd2O3 or CeO2), phosphorus compound ((NH4)2HPO4 or H3PO4), and an additive (urea: CO(NH2) 2, biuret: NH(CONH2)2, cyanuric acid: (CONH)3, or ammonium hydrogen carbonate: NH4HCO3) was heated at 700°C for 3h and then thermal products were analyzed by X-ray diffraction and Fourier transform infrared spectroscopy.
18 citations