lanthanum(III) orthophosphate hydrate

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 镧系含氧阴离子化合物
• 英文名称: lanthanum(III) orthophosphate hydrate
• 英文别名: lanthanum(III) ortophosphate hydrate；lanthanum phosphate hydrate；lanthanum orthophosphate；rhabdophane；Lanthanum(III) phosphate hydrate；lanthanum(3+);phosphate;hydrate
• 化学式: (x)H₂O*La*O₄P
• 分子量: 251.89
• InChiKey: MXLPYXTVXABWIU-UHFFFAOYSA-K

计算性质

• 辛醇/水分配系数(LogP)：
  -3.65
• 重原子数：
  7
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  87.2
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  lanthanum(III) orthophosphate hydrate 以 neat (no solvent, solid phase) 为溶剂， 生成 lanthanum orthophosphate
  参考文献：
  名称：

  通过从磷酸溶液中结晶合成的镧系元素正磷酸盐的热分解

  摘要：

  摘要 沸腾磷酸结晶制备的镧系磷酸盐 LnPO4·H2O（Ln：La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu 和 Y）的热分解特性已提出解决方案。根据对 DTA 和 DTG 曲线观察到的影响，当加热到 1000 °C 时，磷酸盐可分为两组：（a）第一组包括六方（La→Tb）和正交 Dy 磷酸盐，（ b) 第二组由四方 (Ho→Lu) 和 Y 磷酸盐组成。组 (a) 的特征是两个低于 300 °C 的吸热线，与脱水有关，以及一个高于 700 °C 的放热线，与六方/斜方晶向单斜晶的转变有关。多晶型转变的温度随着镧系元素原子序数从 900 °C (Tb, Dy) 的增加而增加。（b）组在很宽的温度范围（100-600°C）内脱水，即使在 950°C 加热后仍保持四方晶体结构。然而，增加的结晶度、a 轴和 c 轴的收缩以及 IR 光谱的差异表明 (Ho→Lu)

  DOI：

  10.1016/s0040-6031(03)00085-6
• 作为产物：
  描述：

  lanthanum hydrogen phosphate 在 H₂O 作用下， 以 乙醇 、 水 为溶剂， 生成 lanthanum(III) orthophosphate hydrate
  参考文献：
  名称：

  Butuzova, T. A.; Mel'nikov, P. P.; Komissarova, L. N., Inorganic Materials, 1986, vol. 22, p. 1000 - 1005

  摘要：

  DOI：

文献信息

• Microwave approach for the synthesis of rhabdophane-type lanthanide orthophosphate (Ln = La, Ce, Nd, Sm, Eu, Gd and Tb) nanorods under solvothermal conditions
  作者：Chitta Ranjan Patra、Gabashvili Alexandra、Sujata Patra、David Solomon Jacob、Aharon Gedanken、Asher Landau、Yossi Gofer

  DOI：10.1039/b415693e

  日期：——

  Rhabdophane-type hexagonal lanthanide orthophosphate, LnPO4·nH2O (Ln = La, Ce, Nd, Sm, Eu, Gd and Tb, n = 0 to 0.6), and body-centered tetragonal ErPO4·nH2O nanowires/nanorods have been successfully synthesized in high yield (>95%) by simple microwave heating of an aqueous solution of Ln(III) nitrate and NH4H2PO4 in the pH range 1.8–2.2. The reaction was conducted in a simple domestic microwave oven. The structure, morphology, composition and physical properties of the as-prepared products have been characterized by powder X-ray diffraction, low resolution transmission electron microscopy, high resolution transmission electron microscopy, selected area electron diffraction, thermogravimetric analysis, differential scanning calorimetry, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The length and width of the resulting lanthanide orthophosphate nanowires/nanorods are in the range 70–2200 nm and 6–130 nm, respectively. A possible mechanism for the formation of LnPO4·nH2O nanowires/nanorods is briefly discussed.

  通过对硝酸镧（III）和 NH4H2PO4 的水溶液在 pH 值为 1.8-2.2 的条件下进行简单的微波加热，成功合成了拉布多芬型六方镧系正磷酸盐 LnPO4-nH2O（Ln = La、Ce、Nd、Sm、Eu、Gd 和 Tb，n = 0 至 0.6）以及体心四边形 ErPO4-nH2O 纳米线/纳米棒，收率高达 95%以上。反应在一个简单的家用微波炉中进行。粉末 X 射线衍射、低分辨率透射电子显微镜、高分辨率透射电子显微镜、选区电子衍射、热重分析、差示扫描量热法、红外光谱、拉曼光谱、X 射线光电子能谱和光致发光光谱对制备产物的结构、形态、成分和物理性质进行了表征。所得正磷酸镧系元素纳米线/纳米棒的长度和宽度分别为 70-2200 纳米和 6-130 纳米。简要讨论了 LnPO4-nH2O 纳米线/纳米棒形成的可能机制。
• Modified Pechini synthesis of La, Ce, and Pr orthophosphates and characterization of obtained powders
  作者：Aleksandra Matraszek、Ewa Radominska、Irena Szczygiel

  DOI：10.1007/s10973-010-1063-7

  日期：2011.3

  In this study, lanthanum, cerium, and praseodymium orthophosphates were synthesized by the modified Pechini method. The compounds were analyzed using XRD, TG/DSC, FTIR methods, and the isothermal nitrogen adsorption technique. The results showed that mesoporous and nanocrystalline powders can be synthesized by this method. Moreover, due to the limited formation of lanthanide polyphosphates on the surface of the powders the modified Pechini method allows better control of the compound stoichiometry in comparison with the commonly used method of phosphates precipitation from solutions rich in H3PO4.

  在本研究中，通过改进的 Pechini 方法合成了正磷酸镧、铈和镨。使用 XRD、TG/DSC、FTIR 方法和等温氮吸附技术对化合物进行了分析。结果表明，该方法可以合成介孔和纳米晶粉末。此外，由于粉末表面上稀土多磷酸盐的形成有限，与常用的从富含 H3PO4 的溶液中沉淀磷酸盐的方法相比，改进的 Pechini 方法可以更好地控制化合物的化学计量。
• Synthesis and Photoluminescence Characterization of Ellipsoidal Lanthanide Orthophosphate Nanoparticles
  作者：Zhouguang Lu、Rui Gao、Wei Li、Boyun Huang

  DOI：10.1111/j.1551-2916.2010.04116.x

  日期：2011.2

  rare-earth orthophosphates, LnPO4·xH2O (Ln=La, Y, Ce, Sm, Gd, Tb, Dy, Er, and Yb), with a mean diameter of ∼100 nm. The procedure involves the formation of homogeneous, transparent, metal–citrate–ethylenediamine tetraacetic acid (EDTA) gel precursors using both citric acid and EDTA as the complexing agents, followed by hydrothermal mineralization to yield the final LnPO4·xH2O nanocrystallites. Techniques

  本文描述了合成一系列稀土正磷酸盐 LnPO4·xH2O（Ln=La、Y、Ce、Sm、Gd、Tb、Dy、Er 和 Yb）的一般水热路线，平均直径为约 100 纳米。该过程包括使用柠檬酸和 EDTA 作为络合剂形成均匀、透明、金属-柠檬酸盐-乙二胺四乙酸 (EDTA) 凝胶前体，然后进行水热矿化以产生最终的 LnPO4·xH2O 纳米微晶。X 射线衍射、透射电子显微镜和高分辨率透射电子显微镜技术已被用于表征合成的 LnPO4·xH2O 纳米晶体。此外，进行了 Eu3+ 掺杂的 LnPO4·xH2O 纳米晶体的光致发光 (PL) 表征。
• Comparison of the crystallisation and solid state reaction methods for the preparation of rare-earth orthophosphates
  作者：Petr Bělina、Veronika Myšková、Petra Šulcová

  DOI：10.1007/s10973-009-0050-3

  日期：2009.6

  Two easy laboratory methods for preparation of rare-earth orthophosphates (crystallisation from phosphoric acid solution and solid-state reaction with (NH4)2HPO4) were compared on the basis of the products’ properties with a focus on their application as new inorganic pigments. The preparation method has a significant influence on optical properties. The samples prepared by crystallisation have lighter and less rich colour and also change colour more under sunlight irradiation. The surface properties analysed by SEM and presence of a greater amount of phosphoric acid in the crystallisation procedure influence the pH and resistivity of aqueous extract of products and thus their corrosion-inhibition properties. The optical properties of rare-earth orthophosphates and their preliminary corrosion tests show their potential application as highly efficient corrosion-inhibition pigments.

  根据产品的特性，比较了制备稀土正磷酸盐的两种简便实验室方法（从磷酸溶液中结晶和与 (NH4)2HPO4 进行固态反应），重点是它们作为新型无机颜料的应用。制备方法对光学特性有很大影响。用结晶法制备的样品颜色较浅、不浓，在阳光照射下变色也较多。通过扫描电子显微镜分析的表面特性和结晶过程中较多的磷酸会影响产品水提取物的 pH 值和电阻率，从而影响其腐蚀抑制特性。稀土正磷酸盐的光学特性及其初步腐蚀测试表明，它们具有作为高效缓蚀颜料的应用潜力。
• Synthesis and Phase Composition of Lanthanide Phosphate Nanoparticles LnPO₄(Ln=La, Gd, Tb, Dy, Y) and Solid Solutions for Fiber Coatings
  作者：Emmanuel E. Boakye、Pavel Mogilevsky、Randall S. Hay、Geoff E. Fair

  DOI：10.1111/j.1551-2916.2008.02737.x

  日期：2008.12

  Rare earth phosphates with rare earths of Gd, Tb, and Dy can form either monazite or xenotime. Hydrated lanthanide phosphate precursors to monazite and xenotime were made in aqueous solution. The particles were formed by adding dilute phosphoric acid (H3PO4) to either; (a) lanthanide citrate (Ln-Cit) or (b) lanthanide nitrate (LnNO3) [Ln=La, Gd, Tb, Dy, and Y] solutions followed by altering the pH from

  稀土磷酸盐与 Gd、Tb 和 Dy 稀土可形成独居石或磷钇矿。独居石和磷钇矿的水合镧系元素磷酸盐前体在水溶液中制备。颗粒是通过将稀磷酸 (H3PO4) 添加到其中之一而形成的；(a) 镧系元素柠檬酸盐 (Ln-Cit) 或 (b) 镧系元素硝酸盐 (LnNO3) [Ln=La、Gd、Tb、Dy 和 Y] 溶液，然后用氢氧化铵将 pH 从~1 更改为~10。前体粒径和形态通过扫描电子显微镜（SEM）表征，重量损失通过热重分析（TGA）表征。通过差热分析 (DTA) 和 X 射线衍射确定温度下的相存在。讨论了前驱体制备方法对热处理后独居石或磷钇矿存在的影响。