13761-79-0Relevant articles and documents
Aluminum phosphates with non-centrosymmetric layer- and framework-structures of topologically related motifs: 2. KAl2(PO4)2(OH)·2H2O
Dick, Stefan,Gro?mann, Gisbert,Ohms, Gisela,Mu?ller, Manfred
, p. 1447 - 1455 (1997)
KAl2(PO4)2(OH)·2H2O was obtained by the reaction of gibbsite with a potassium-phosphate solution of pH = 5.5 at 373 K. A single crystal X-ray structure analysis showed that it is an ordered, F-free K-analog of the microporous compound AlPO4-CI2. Crystal data: orthorhombic space group P212121, a = 920.5(1), b = 970.7(2), c = 982.8(2) pm, Z = 4. The structure consists of dimeric units of AlO6 octahedra and AlO5 trigonal bipyramids, bridged by an OH and two bidentate phosphate groups. The dimers are linked by phosphate to form corrugated layers which are topologically related to the layers in KAl2(PO4)2(OH)·2H2O and minyulite. The layers are connected by Al-O-P and hydrogen bonds to a three dimensional framework structure with K ions in channel-like cavities. A neutron powder scattering experiment with KAl2(PO4)2(OD)·2D2O showed that the bridging OD group and only one D of each water molecule are involved in hydrogen bonding. 31P MAS NMR spectra show two isotropic lines at δiso = -6.9 and -18,7 ppm of the intensity ratio 1:1 and confirm the presence of two crystallographically independent P atoms in the unit cell. In the 1H MAS NMR spectra the water molecules and the bridging OH group show signals at 5.9 and 1.1 ppm, respectively.
Aluminum phosphates with non-centrosymmetric layer- and framework-structures of topologically related motifs: 1. KAl2(PO4)2(OH)·4H2O
Dick, Stefan,Gro?mann, Gisbert,Ohms, Gisela,Zeiske, Thomas
, p. 1439 - 1446 (1997)
KAl2(PO4)2(OH)·4H2O could be obtained by the reaction of gibbsite with a potassium-phosphate solution of pH = 5.5 at 333 K. A single crystal X-ray structure analysis showed that KAl2(PO4)2(OH)·4H2O is isotypic with the mineral minyulite. Crystal data: orthorhombic space group Pba2, a = 934.7(1), b = 982, 1(1), c = 551, 0(1) pm, Z = 2. It possesses dimeric units of Al-octahedra which are bridged by an OH- and two bidentate phosphate groups. The dimers are linked by phosphate to plane polar layers. Cavities in the layers are occupied by K ions. One corner of each phosphate tetrahedron is not connected to Al but accepts four hydrogen bonds from water molecules bound to Al of the adjacent layer. A powder neutron scattering experiment with KAl2(PO4)2(OD)·4D2O showed that four D atoms and P coordinate the hydrogen bond accepting O in KAl2(PO4)2(OD)·4D2O like a square pyramid. Analogous dimeric building units are found in the Al phosphate minerals minyulite and morinite; similar dimers of Fe octahedra occur in the mineral copiapite, a number of Fe containing enzymes and numerous synthetic iron complexes. High-resolution 31P solid-state NMR spectra show only one isotropic line at δiso = -9.6 ppm and confirm the presence of one symmetry independent phosphorus site in the unit cell. In the 1H-MAS-NMR spectra the water molecules and the bridging OH groups show signals at 5.4 and 1.4 ppm, respectively.
Electron Distribution of Hydrogen and Deuteron in KH2PO4 and KD2PO4
Hayashide, Tadao,Noda, Yukio
, p. 270 - 271 (1997)
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Preparation of alkali-metal dideuterium phosphates
Lokshin
, p. 720 - 722 (2008/10/08)
Methods for the preparation of deuterated orthophosphoric acid and alkali-metal dideuterium phosphates are discussed. The easiest and cheapest way of producing these compounds is via the hydration of massive P2O5 polycrystals obtained by vacuum distillation.
