磷酸二氢盐-d2(钾)是氘标记的磷酸二氢钾[1]。磷酸二氢钾(DiA)是一种常用的生物测定缓冲液,广泛应用于实验中。它是一种中等至高浓度的磷酸二氢钾水溶液,常用于制备磷酸盐缓冲液及其他实验室应用。
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
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 AIPO4-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 AIO6 octahedra and AIO5 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)·4H2O 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.
通过在373K下,将铝水合氧化物与pH=5.5的磷酸钾溶液反应,制备得到了KAl2(PO4)2(OH)·2H2O。单晶X射线结构分析表明,它是一种有序的、不含氟的微孔化合物AIPO4-CI2的K类似物。晶体数据:正交晶系空间群P212121,a = 920.5(1) pm,b = 970.7(2) pm,c = 982.8(2) pm,Z = 4。结构由AIO6八面体和AIO5三角双锥体的二聚体单元构成,由一个OH和两个双齿磷酸根桥联。这些二聚体通过磷酸根桥联形成波浪形层,与KAl2(PO4)2(OH)·4H2O和minyulite中的层具有拓扑关系。这些层通过Al-O-P和氢键连接到具有通道状空腔的三维框架结构中的K离子。KAl2(PO4)2(OD)·2D2O的中子粉末散射实验表明,桥接OD基团和每个水分子中的一个D参与氢键形成。
31P MAS NMR光谱显示在δiso = -6.9和-18.7 ppm处有两条等效的线,强度比为1:1,证实了晶胞中存在两个晶体学独立的P原子。在1H MAS NMR光谱中,水分子和桥接的OH基团分别显示出5.9和1.1 ppm的信号。