magnesium tungstate

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 碱土金属氧阴离子化合物
• 英文名称: magnesium tungstate
• 英文别名: magnesium;dioxido(dioxo)tungsten
• 化学式: Mg*O₄W
• 分子量: 272.153
• InChiKey: DJZHPOJZOWHJPP-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -3.0
• 重原子数：
  6
• 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：
  80.3
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  magnesium tungstate 、 氯 以 neat (no solvent) 为溶剂， 生成 magnesium chloride
  参考文献：
  名称：

  Zum Chemischer Transport ternärer Übergangsmetall- und Erdalkaliwolframate MWO4 mit Chlor

  摘要：

  关于三元过渡金属和地球碱性钨酸盐 MWO4 与氯的化学蒸汽传输研究了过渡金属钨酸盐 MWO4（M=Mn、Co、Ni、Cu、Zn、Cd）的化学蒸汽传输与平均传输温度的关系（ 923 K 至 1223 K) 和运输剂 Cl2 的量。根据实验条件，所有钨酸盐以 ΔT = 100 K 的温度梯度从较高温度区域迁移到较低温度区域，迁移速率为 0.5 至 8 mg/h。通过在传输实验期间连续测量质量变化来确定传输行为。将结果与热化学计算进行比较，并详细讨论了水分含量的影响。MgWO4 在 Cl2 的影响下以 1273 K 至 1173 K 的温度梯度迁移（迁移速率 0.7 mg/h），

  DOI：

  10.1002/zaac.200500095
• 作为产物：
  描述：

  以 neat (no solvent, solid phase) 为溶剂， 生成 magnesium tungstate
  参考文献：
  名称：

  Metatungstate and tungstoniobate-containing LDHs: Preparation, characterisation and activity in epoxidation of cyclooctene

  摘要：

  Polyoxometalates (POMs) H2W12O406- and W4Nb2O194- have been intercalated between the brucite-like layers of Mg, Al and Zn, Al hydrotalcites by anion exchange, starting from the corresponding nitrate precursors. The solids have been characterised by Powder X-ray Diffraction (PXRD), Fourier Transform infrared (FT-IR) spectroscopy, N-2 adsorption-desorption at -196 degrees C and thermogravimetric (TG) and differential thermal analyses (DTA), and have been tested in the epoxidation of cyclooctene using H2O2 or t-BuOOH as oxidants. The results show that both anions are effectively located in the interlayer space maintaining their pristine structures without depolymerisation. Upon intercalation of such large anions microporosity is developed and subsequently an increase in the specific surface 06areas is also observed. In general, the prepared materials possess catalase and epoxidation activity, with ZnAl-intercalated H2W12O406- giving the best results in terms of epoxide yield (17% at 24 h). Product selectivity is different for the intercalated and free POMs, the latter yielding 1,2-cyclooctanediol as the only product, whereas the former produces only the epoxide. The epoxidation reaction seems to be catalysed in homogeneous phase by the POM. (c) 2007 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.jpcs.2007.05.012

文献信息

• Synthesis of Tungstate Thin Films and Their Optical Properties
  作者：Nobuhiro Saito、Akihiko Kudo、Tadayoshi Sakata

  DOI：10.1246/bcsj.69.1241

  日期：1996.5

  synthetic method of tungstate thin films (CaWO4, MgWO4, PbWO4, ZnWO4) was developed. The absorption and luminescence spectra of tungstate thin films synthesized on quartz substrates were measured; the optical properties were also studied. It was found that CaWO4 has Eg = 5.4 eV of a direct transition nature. Tungstate thin films were strongly luminescent when irradiated with UV-light. Excitation at around

  开发了一种新的钨酸盐薄膜（CaWO4、MgWO4、PbWO4、ZnWO4）的合成方法。测量了在石英衬底上合成的钨酸盐薄膜的吸收光谱和发光光谱；还研究了光学特性。发现 CaWO4 具有直接过渡性质的 Eg = 5.4 eV。钨酸盐薄膜在紫外线照射下会发出强烈的光。290 nm 附近的激发被解释为单线态-三线态跃迁。
• Structure and calorimetric study of complex oxides based on lanthanum, tungsten, and alkaline earth elements MeLa2WO7 (Me = Mg, Ca, Sr, Ba)
  作者：Mira R. Bissengaliyeva、Ramazan M. Zhakupov、Alexander V. Knyazev、Daniil B. Gogol、Shynar T. Taimassova、Bakhyt K. Balbekova、Nuraly S. Bekturganov

  DOI：10.1007/s10973-020-09315-5

  日期：2020.12

  general formula MeLa2WO7 (Me = Mg, Ca, Sr, Ba). The structure of the samples obtained was studied by the X-ray diffraction, electron probe, and X-ray spectral microanalysis; the infrared and Raman spectra of the compounds were obtained. The results of indexing for SrLa2WO7 and BaLa2WO7 are in good agreement with the previously published crystallographic data. The heat capacity of the samples was measured

  通过“溶胶-凝胶”法合成柠檬酸盐，我们得到了通式为MeLa2WO7（Me = Mg、Ca、Sr、Ba）的镧、钨和碱土元素的三元氧化物样品。通过X射线衍射、电子探针和X射线光谱显微分析对所得样品的结构进行了研究；获得了化合物的红外光谱和拉曼光谱。SrLa2WO7 和 BaLa2WO7 的索引结果与先前公布的晶体学数据非常吻合。采用绝热量热法测量样品的热容，计算其热力学函数。
• Metal-to-Metal Charge Transfer in AWO₄ (A = Mg, Mn, Co, Ni, Cu, or Zn) Compounds with the Wolframite Structure
  作者：Swagata Dey、Rebecca A. Ricciardo、Heather L. Cuthbert、Patrick M. Woodward

  DOI：10.1021/ic4031798

  日期：2014.5.5

  Using a combination of UV–visible spectroscopy and electronic structure calculations, we have characterized the electronic structures and optical properties of AWO4 (A = Mn, Co, Ni, Cu, Zn, or Mg) tungstates with the wolframite structure. In MgWO4 and ZnWO4, the lowest energy optical excitation is a ligand to metal charge transfer (LMCT) excitation from oxygen 2p nonbonding orbitals to antibonding

  通过结合紫外可见光谱和电子结构计算，我们表征了具有黑钨矿结构的钨酸钨酸盐4（A = Mn，Co，Ni，Cu，Zn或Mg）的电子结构和光学性质。在MgWO 4和ZnWO 4中，最低能级的光激发是从氧2p非键轨道到反键W 5d轨道的金属电荷转移（LMCT）激发的配体。这两种化合物中LMCT跃迁的能量对于ZnWO 4是3.95 eV，对于MgWO 4是4.06 eV。。对于其他化合物，观察到的电荷转移能量要小得多，落在光谱的可见光范围内，范围为2.3至3.0 eV。在这些化合物中，A 2+离子的部分占据的3d轨道充当HOMO，而不是O 2p轨道。最低的能量电荷转移激发现在变成金属间电荷转移（MMCT）激发，其中电子从A 2+离子的占据3d轨道转移到未占据的反键W 5d状态。由于由Cu 2+的d 9构型驱动的晶体结构变形，CuWO 4的MMCT值为2.31 eV最低。降低晶体对称性至三斜晶系的离子
• Study on Organic Dye Removal in Wastewater Treatment and Purification Technology Using MgWO4@Carbon Quantum Dot Composite Photocatalyst
  作者：Xu Hongmei、Huo Yizhen

  DOI：10.1134/s0036024421060157

  日期：2021.6

  sol–gel method combined hydrothermal reaction method. When carbon quantum dots were dotted on the MgWO4 surface, the crystal structure of the main lattice MgWO4 was not changed, but its light absorption capacity was significantly enhanced and extended to the visible light range. SEM-observation shows that the surface of MgWO4 modified by carbon quantum dots is no longer smooth and dotted with many fine

  摘要 采用溶胶-凝胶法结合水热反应法合成了MgWO 4 @CQDs复合光催化剂。当碳量子点的MgWO上散布4表面，所述主晶格MgWO的晶体结构4没有改变，但其光吸收能力为显著增强和扩展到可见光范围内。SEM观察表明，碳量子点改性的MgWO 4表面不再光滑，散布着许多细小颗粒。电化学实验表明，MgWO 4 @CQDs 光催化剂比MgWO 4具有更高的电荷转移和分离效率。光催化实验证实 MgWO 4@CQDs 光催化剂具有较高的可见光催化活性，是一种潜在的可见光催化剂。结合实验分析和能带理论，在模拟阳光照射下，羟基自由基和空穴在罗丹明B的光催化降解中起主要作用。
• Co-precipitation synthesis, photoluminescence properties and theoretical calculations of MgWO₄:Eu³⁺phosphors
  作者：Xu Feng、Wenlin Feng、Meng Xia、Ke Wang、Honggang Liu、Dashen Deng、Xiang Qin、Weikun Yao、Wentao Zhu

  DOI：10.1039/c5ra22631g

  日期：——

  with maxima at 615 nm can be achieved in the MgWO4 host while being excited by near-UV light (393 nm) or blue light (464 nm). The CIE chromaticity coordinates of MgWO4:Eu3+ phosphors exhibit emission in the red-light region. Moreover, to explain the fluorescence spectra of MgWO4:Eu3+ phosphors, a complete energy matrix is successfully built by an effective operator Hamiltonian including free ion and crystal

  通过共沉淀法成功合成了新型的红色发光磷光材料MgWO 4：Eu 3+。使用X射线衍射（XRD），光致发光和发光衰减光谱来表征所制备的磷光体的结构，发光性质和荧光寿命。结果表明，在MgWO 4主体中，当被近紫外光（393 nm）或蓝光激发时，可以在615 nm处实现Eu 3+红色发射的有效电偶极跃迁5 D 0 – 7 F 2，最大值为615 nm。（464纳米）。MgWO 4：Eu 3+的CIE色度坐标磷光体在红光区域显示发射。此外，为了解释MgWO 4：Eu 3+荧光粉的荧光光谱，有效的算子哈密顿量成功地建立了包括自由离子和晶体场相互作用在内的完整能量矩阵。由该基质计算出MgWO 4晶体的单斜（C 2v）Mg 2+位点处的Eu 3+离子的荧光光谱。拟合值与观察结果一致。