硝酸镧

• 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
• 中文名称: 硝酸镧
• 中文别名: 硝酸镧(III)五水合物
• 英文名称: lanthanum(3+);trinitrate;hydrate
• 化学式: 6H₂O*LaN₃O₉
• 分子量: 433.012
• InChiKey: HVMFKXBHFRRAAD-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -1.54
• 重原子数：
  14
• 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：
  190
• 氢给体数：
  1
• 氢受体数：
  10

反应信息

• 作为反应物：
  描述：

  氯化镧水合物 、 硝酸镧 在 HCl 、 NH₄OH 作用下， 以 水 为溶剂， 生成 lanthanum(III) oxochloride
  参考文献：
  名称：

  Surface Acidity and Basicity of La₂O₃, LaOCl, and LaCl₃ Characterized by IR Spectroscopy, TPD, and DFT Calculations

  摘要：

  Adsorption sites of La2O3, LaOCl, and LaCl3 catalysts were characterized with probe molecules using infrared spectroscopy, temperature-programmed desorption (TPD), and density-functional theory (DFT) calculations. Surface acid sites were probed with CO, pyridine, and 2,6-dimethylpyridine (DMP), and basic sites were probed With CO2. Shifts of the CO vibrational frequency at low surface coverage at 77 K suggest that the strength of Lewis acid sites increases with the concentration of Cl in the material; i.e., La2O3 < LaOCl < LaCl3. DFT estimates for CO adsorption energies and LUMO energies were consistent with this ranking. On the basis of a downward shift of the surface OH stretching bands interacting with CO, pyridine, and DMP spectra at room temperature (RT) and TPD results, and confirmed by DFT calculations, the strength of Bronsted acid sites was concluded to increase in the same order. Additional DFT calculations with a frequency analysis were used to elucidate CO2 adsorption modes. DFT calculations and IR spectra Of CO2 adsorbed on LaOCl suggest that CO2 forms coupled bridged species. Proton affinity calculations were used to rank the basicity strength of surface I and Cl sites. The amount of CO2 adsorbed on LaCl3 was negligibly small, confirming the requirement of lattice O adsorption sites. IR spectra Of CO2 adsorbed on La2O3 at RT were similar to those of bulk La-2(CO3)(3) and, accordingly, were assigned to the formation of polydentate and bulk carbonates. CO2 evolution from La2O3 in TPD experiments closely matched the reported thermal stability of La-2(CO3)(3).

  DOI：

  10.1021/jp040311m

文献信息

• Method of making metal oxide ceramic powders by using a combustible
  申请人：Battelle Memorial Institute

  公开号：US05114702A1

  公开（公告）日：1992-05-19

  This invention is directed to the formation of homogeneous, aqueous precursor mixtures of at least one substantially soluble metal salt and a substantially soluble, combustible co-reactant compound, typically an amino acid. This produces, upon evaporation, a substantially homogeneous intermediate material having a total solids level which would support combustion. The homogeneous intermediate material essentially comprises highly dispersed or solvated metal constituents and the co-reactant compound. The intermediate material is quite flammable. A metal oxide powder results on ignition of the intermediate product which combusts same to produce the product powder.

  本发明旨在形成至少一种基本可溶的金属盐和一种基本可溶的可燃共反应化合物（通常是氨基酸）的均质水性前体混合物。这样，在蒸发后，就会产生一种具有可燃性的总固体水平的基本均质中间物。均质中间物基本上由高度分散或溶解的金属成分和共反应剂化合物组成。中间物是相当易燃的。在点燃中间产物时，会产生金属氧化物粉末，其燃烧产生产品粉末。
• Preparation and structures of polymeric lanthanide nitrate complexes of CH3C[CH2P(O)Ph2]3
  作者：Anthony M.J. Lees、Andrew W.G. Platt

  DOI：10.1016/j.poly.2004.12.003

  日期：2005.2

  The synthesis of complexes between lanthanide nitrates and MeC(CH2P(O)Ph-2)(3) (=L) in ethanol or methanol leads to the formation of polymeric complexes Ln(NO3)(3)L as alcohol solvates. The ligand adopts a chelating-bridging mode. The structures of the complexes La(NO3)(3)L . EtOH and Pr(NO3)(3)L . MeOH are reported and the coordination of L is discussed in terms of that of the related free ligand EtC(CH2P(O)Ph-2)(3). Infrared spectroscopy implies structural differences between the early and later lanthanide complexes. (C) 2004 Elsevier Ltd. All rights reserved.
• Surface Acidity and Basicity of La₂O₃, LaOCl, and LaCl₃ Characterized by IR Spectroscopy, TPD, and DFT Calculations
  作者：Olga V. Manoilova、Simon G. Podkolzin、Balarishna Tope、Johannes Lercher、Eric E. Stangland、Jean-Michel Goupil、Bert M. Weckhuysen

  DOI：10.1021/jp040311m

  日期：2004.10.1

  Adsorption sites of La2O3, LaOCl, and LaCl3 catalysts were characterized with probe molecules using infrared spectroscopy, temperature-programmed desorption (TPD), and density-functional theory (DFT) calculations. Surface acid sites were probed with CO, pyridine, and 2,6-dimethylpyridine (DMP), and basic sites were probed With CO2. Shifts of the CO vibrational frequency at low surface coverage at 77 K suggest that the strength of Lewis acid sites increases with the concentration of Cl in the material; i.e., La2O3 < LaOCl < LaCl3. DFT estimates for CO adsorption energies and LUMO energies were consistent with this ranking. On the basis of a downward shift of the surface OH stretching bands interacting with CO, pyridine, and DMP spectra at room temperature (RT) and TPD results, and confirmed by DFT calculations, the strength of Bronsted acid sites was concluded to increase in the same order. Additional DFT calculations with a frequency analysis were used to elucidate CO2 adsorption modes. DFT calculations and IR spectra Of CO2 adsorbed on LaOCl suggest that CO2 forms coupled bridged species. Proton affinity calculations were used to rank the basicity strength of surface I and Cl sites. The amount of CO2 adsorbed on LaCl3 was negligibly small, confirming the requirement of lattice O adsorption sites. IR spectra Of CO2 adsorbed on La2O3 at RT were similar to those of bulk La-2(CO3)(3) and, accordingly, were assigned to the formation of polydentate and bulk carbonates. CO2 evolution from La2O3 in TPD experiments closely matched the reported thermal stability of La-2(CO3)(3).