lanthanum iodate

• 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 iodate
• 英文别名: Lanthanum(3+);iodate
• 化学式: 3IO₃*La
• 分子量: 663.614
• InChiKey: WEOVHLKOBNCPQN-UHFFFAOYSA-M

计算性质

• 辛醇/水分配系数(LogP)：
  -6.56
• 重原子数：
  5
• 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：
  57.2
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  水 、 lanthanum iodate 反应 24.0h， 生成 lanthanum iodate hemihydrate
  参考文献：
  名称：

  微波辅助合成SHG活性α-La（IO3）3纳米晶体的反应中间体的证据

  摘要：

  我们在这里探索在微波辅助水热过程中，各种合成条件如何影响不同碘酸镧化合物的形成：α-La（IO 3）3，La（IO 3）3（H 2 O），La（IO 3）3（HIO 3）和La（IO 3）2.66（OH）0.66。无论初始[拉3+ ]：[IO 3 - ]的比值，α-的La（IO 3）3如果合成温度超过220°C，则结晶。还讨论了固态或水热合成下的相变。有趣的是，我们证明了水热合成过程中通过适当的水热过程将新水合物形式的La（IO 3）3（H 2 O）转变为稳定的旋光性α-La（IO 3）3的全相转变。这种演变可以通过镧原子配位域的结构重排来解释，从而使结构稳定。

  DOI：

  10.1039/d0ce00156b
• 作为产物：
  描述：

  以 neat (no solvent) 为溶剂， 生成 lanthanum iodate
  参考文献：
  名称：

  无水碘化镧多晶型物的结构，热行为和发光性质

  摘要：

  介绍了六种无水碘酸镧多晶型物的结构和热研究。起始溶液中[IO 3 – ]：[La 3+ ]摩尔比的变化和溶液的蒸发速率导致中心La（IO 3）3（HIO 3）或中心La（IO 3））3（HIO 3）1.33相。确定了La（IO 3）3（HIO 3）1.33的晶体结构。这两个阶段的热处理温度高达490°C，导致产生β-La（IO 3）3，在室温下观察。为了更好地理解La（IO 3）3（HIO 3）1.33和La（IO 3）3（HIO 3）化合物的相似热行为及其结构演变，热重分析-差热分析（​​TG-DTA），差示扫描量热法（DSC）分析和原位温度依赖性粉末X射线衍射（XRD）实验进行。这些实验使我们能够突出δ-La（IO 3）3和γ-La（IO 3）3的连续形成。δ-La（IO 3）3从La（IO 3）3（HIO 3）1.33（在340°C）或La（IO 3）3（HIO 3）（在300°C）

  DOI：

  10.1021/acs.inorgchem.5b00187

文献信息

• Syntheses, crystal structures, and properties of three new lanthanum(iii) vanadium iodates
  作者：Chuan-Fu Sun、Ting Hu、Xiang Xu、Jiang-Gao Mao

  DOI：10.1039/c0dt00305k

  日期：——

  Systematic explorations of new compounds in the La3+–V4+/V5+-iodate system led to three new lanthanum(III) vanadium iodates, namely, LaVO(IO3)5, LaV2O6(IO3), and LaVO2(IO3)4·H2O. LaVO(IO3)5 is isostructural with LaTiO(IO3)5 and its structure contains a 0D [VO(IO3)5]3− anionic unit composed of one VO6 octahedron linked to five IO3− groups. Such 0D anionic units are separated by La3+ ions. LaV2O6(IO3)

  系统地探索La 3+ –V 4+ / V 5+中的新化合物-碘酸盐系统导致三个新的镧（III）钒碘酸盐，即，LAVO（IO 3）5，LAV 2 ö 6（IO 3），和LAVO 2（IO 3）4 ·H 2 O. LAVO（IO 3）5是同结构LaTiO（IO 3）5，其结构包含一个0D [VO（IO 3）5 ] 3-阴离子VO一种构成单元6八面体连接至五个IO 3 -基团。这样的0D 阴离子单元被 La 3+离子。LaV 2 O 6（IO 3）展示了一个独特的3D框架，该框架由1D [V 2 O 6 ] 2-梯形链和2D [La（IO 3）] 2+层组成。LaVO 2（IO 3）4 ·H 2 O与LnMoO 2（IO 3）4（OH）同构（Ln =啦啦， 钕， m， 欧盟）的极性空间群为P 2 1，其结构包含一个新颖的0D[VO 2（IO 3）4 ] 3- VO一种构成阴离子单元6八面体具有四个IO连接3
• Thermal and dielectric properties of rare earth iodates
  作者：B. P. Ghosh、K. Nag

  DOI：10.1007/bf00556063

  日期：1985.7

  (lanthanum, cerium to europium, gadolinium to terbium, dysprosium to lutetium). Dielectric measurements of Ln (IO3)3 at varying temperature have corroborated the observations made with DSC studies. Relatively low dielectric constants of the high-temperature phases probably indicate their centrosymmetric structures. The dielectric behaviour of noncentrosymmetric Ln (IO3)3·H2O (Ln=cerium to samarium)

  研究了所有稀土碘酸盐（普罗米修除外）的热（TGA、DTA 和 DSC）和介电行为。镧、铈到铕和钆到镥的碘酸盐分解不同，这些分解反应的活化能已经确定。DSC 测量表明，所有无水碘酸盐都会发生一种或多种放热/吸热变化。根据 DSC 曲线的性质、转变热和粉末衍射数据，已发现 Ln (IO3)3 的相变以四种不同的方式发生（镧、铈到铕、钆到铽、镝到镥）。Ln (IO3)3 在不同温度下的介电测量证实了 DSC 研究的观察结果。高温相的介电常数相对较低可能表明它们的中心对称结构。非中心对称 Ln (IO3)3·H2O（Ln=铈到钐）的介电行为已在 30 到 -160°C 的温度范围内进行了研究。它们在环境温度下具有高介电常数（εr，~1800 到 2400）并且在整个调查温度范围内没有显示出显着变化。
• ε-La(IO₃)₃: A Polar Iodate with High Thermal Stability and a Large Second-Harmonic-Generation Response Obtained by a Supercritical Hydrothermal Method
  作者：Dandan Wang、Xinyuan Zhang、Pifu Gong、Zheshuai Lin、Zhanggui Hu、Yicheng Wu

  DOI：10.1021/acs.inorgchem.3c00868

  日期：2023.5.1

  Attributed to its noncentrosymmetric arrangement, ε-La(IO3)3 is second-harmonic-generation (SHG)-active and the powder SHG response is measured to be 11.1 × KH2PO4 at 1064 nm in the 26–50 μm particle size range. This work has enriched the structural diversity of iodates and would further promote the materials’ exploration under a supercritical hydrothermal method.

  高温高压的合成条件有利于探索具有新结构和新性能的新化合物。在这项工作中，通过高温高压（T = 400 °C 和P ≈ 25 MPa）的超临界水热法获得了一种新的极性碘酸盐 ε-La(IO 3 ) 3 。与已知相不同，ε-La(IO 3 ) 3在手性空间群P 2 1中结晶，该空间群具有三维框架，其中多个 IO 3 –群沿着 LaO x多面体的不同方向堆叠。ε-La(IO 3 )3具有高达 525 °C 的高热稳定性，并表现出约 4.05 eV 的宽带隙。由于其非中心对称排列，ε-La(IO 3 ) 3具有二次谐波产生 (SHG) 活性，在26–50 μm 颗粒中，粉末 SHG 响应在 1064 nm 处测量为11.1 × KH 2 PO 4尺寸范围。该工作丰富了碘酸盐的结构多样性，将进一步推动材料在超临界水热法下的探索。
• Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO₃)₃ Nanocrystals
  作者：Sylvain Regny、Jérémy Riporto、Yannick Mugnier、Ronan Le Dantec、Stéphanie Kodjikian、Sébastien Pairis、Isabelle Gautier-Luneau、Géraldine Dantelle

  DOI：10.1021/acs.inorgchem.8b03208

  日期：2019.1.22

  Pure alpha-La(IO3)(3) and alpha-La0.85Er0.15(IO3)(3) nanocrystals were synthesized by a microwave-assisted hydrothermal method leading to a reaction yield of 87 +/- 4%. Electron microscopy and dynamic light scattering characterizations provide evidence for the formation of nanocrystals with an average size of 45 +/- 10 nm for alpha-La(IO3)(3) and 55 +/- 10 nm for alpha-La0.85Er0.15(IO3)(3). When dispersed in ethylene glycol, the nanocrystal suspensions exhibit second-harmonic generation under near-infrared excitations at 800 and 980 nm whereas additional photoluminescence by up-conversion is simultaneously observed in the case of a-La0.85Er0.15(IO3)(3) nanocrystals. Quantitative assessments of the second-harmonic generation efficiency from second-harmonic scattering experiments at 1064 nm result in relatively high (d) coefficients measured at 8.2 +/- 2.0 and 8.0 +/- 2.0 pm V-1 for alpha-La(IO3)(3) and alpha-La0.85Er0.15(IO3)(3), respectively. The relative intensity between second-harmonic generation and photoluminescence is discussed following the excitation wavelength.
• New Metal Iodates:  Syntheses, Structures, and Characterizations of Noncentrosymmetric La(IO₃)₃ and NaYI₄O₁₂ and Centrosymmetric β-Cs₂I₄O₁₁ and Rb₂I₆O₁₅(OH)₂·H₂O
  作者：Kang Min Ok、P. Shiv Halasyamani

  DOI：10.1021/ic051340u

  日期：2005.12.1

  Four new metal iodates, beta-CS2 vertical bar O-4(11), Rb2I6O15(OH)(2)(H2O)-H-., La(IO3)(3), and NaYl(4)O(12), have been synthesized hydrothermally, and the structures were determined by single-crystal X-ray diffraction techniques. All of the reported materials contain I5+ cations that are in asymmetric coordination environments attributable to their stereoactive lone pair. Second-order nonlinear optical measurements on noncentrosymmetric La(IO3)(3) and NaYI4O12, using 1064nm radiation, indicate that both materials have second-harmonic-generating properties with efficiencies of approximately 400 X SiO2. Converse piezoelectric measurements revealed d(33) values of 5 and 138 pm V-1 for La(IO3)(3) and NaYl(4)O(12), respectively. Infrared and Raman spectroscopy and thermogravimetric analyses are also presented for all of the reported materials. Crystal data: beta-Cs-2 vertical bar O-4(11), monoclinic, space group P2(1)vertical bar n (No. 14), with a = 12.7662(14) angstrom, b = 7.4598(8) angstrom, c = 14.4044(16) angstrom, beta = 106.993(2)degrees, V = 1311.9(2) angstrom(3), and Z= 4; Rb2I6O15(OH)(2)(H2O)-H-., triclinic, space group P (1) over bar (No. 2), with a = 7.0652(17) angstrom b = 7.5066(18) angstrom, c = 18.262(4) angstrom, alpha = 79.679(4)degrees, beta = 85.185(4)degrees, gamma = 70.684(4)degrees, V = 898.9(4) angstrom(3), and Z = 2; La(IO3)(3), monoclinic, space group Cc (No. 9), with a = 12.526(2) angstrom, b = 7.0939(g) angstrom, c = 27.823(4) angstrom, beta = 101.975(4)degrees, V = 2418.4(6) angstrom(3), and Z = 4; NaYl(4)O(12), monoclinic, space group Cc (No. 9), with a = 31.235(3) angstrom, b = 5.5679(5) angstrom, c = 12.5451(12) angstrom, beta = 91.120(3)degrees, V = 2181.3(4) angstrom(3), and Z = 4.