13597-72-3Relevant articles and documents
High-Pressure Metathesis of the M 1- xPO3+4 xN1-4 x (x ≈ 0.05) and M 0.75PO4 (M = Zr, Hf) Orthophosphates
Klo?, Simon D.,Weis, Andreas,Wandelt, Sophia,Schnick, Wolfgang
, p. 4164 - 4170 (2018)
We describe the oxonitridophosphates M1-xPO3+4xN1-4x (x -0.05) and the isotypic oxophosphates M0.75PO4 (M = Zr, Hf) obtained by high-pressure metathesis. The structures (ZrSiO4-type, space group I41/amd (no. 141), a = 6.5335(7)-6.6178(12), c = 5.7699(7)-5.8409(9) ?, Z = 4) were refined from single-crystal X-ray diffraction data, and the powder samples were examined with quantitative Rietveld refinement. Infrared spectroscopy did not indicate the presence of X-H (X = O, N) bonds. The optical band gaps, between 3.5 and 4.3 eV, were estimated from UV-vis data using the Kubelka-Munk function under assumption of a direct band gap. Temperature-dependent powder X-ray diffraction showed a phase transformation of the M0.75PO4 (M = Zr, Hf) compounds to ambient pressure polymorphs at 780 (Zr) and 900 °C (Hf). The preparation of the nitrogen containing compounds exemplifies the systematic access to the new class of group 4 nitridophosphates granted by high-pressure metathesis. Moreover, we show that high-pressure metathesis can also be used for the preparation of metastable oxophosphates.
Ba6P12N17O9Br3- A column-type phosphate structure solved from single-nanocrystal data obtained by automated electron diffraction tomography
Mugnaioli, Enrico,Sedlmaier, Stefan J.,Oeckler, Oliver,Kolb, Ute,Schnick, Wolfgang
, p. 121 - 125 (2012/04/17)
Oxonitridophosphate Ba6P12N17O 9Br3 was synthesized by heating a multicomponent mixture of BaBr2, BaS, phosphoryl triamide and thiophosphoryl triamide in an evacuated and sealed silica-glass ampoule to 750 °C. Ba6P 12N17O9Br3 was obtained as the main product as a nanocrystalline powder. The crystal structure was determined ab initio on the basis of electron diffraction data acquired from a single needle-shaped nanocrystal by automated diffraction tomography. Ba 6P12N17O9Br3 crystallizes in the hexagonal space group P63/m (no. 176) with unit cell parameters a = 14.654(19), c = 8.255(9) A and Z = 2. Its structure includes triangular, column-shaped anions of ∞ 1{(P12N17O9)9-}, which are built from vertex-sharing P(O,N)4 tetrahedra with 3-rings and three-coordinate nitrogen atoms. The 1D anions are separated by Ba2+ and Br- ions, which are arranged in channels parallel to the phosphate anions along [001]. The Ba2+ ions are eight- and nine-coordinated by Br- and O/N atoms, respectively.
Functionalized ionic liquids, and methods of use thereof
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, (2008/06/13)
One aspect of the present invention relates to ionic liquids comprising a pendant Bronsted-acidic group, e.g., a sulfonic acid group. Another aspect of the present invention relates to the use of an ionic liquid comprising a pendant Bronsted-acidic group to catalyze a Bronsted-acid-catalyzed chemical reaction. A third aspect of the present invention relates to ionic liquids comprising a pendant nucleophilic group, e.g., an amine. Still another aspect of the present invention relates to the use of an ionic liquid comprising a pendant nucleophilic group to catalyze a nucleophile-assisted chemical reaction. A fifth aspect of the present invention relates to the use of an ionic liquid comprising a pendant nucleophilic group to remove a gaseous impurity, e.g., carbon dioxide, from a gas, e.g., sour natural gas.
