europium carbonate | 5772-74-7

• 物质功能分类: 有机原料 - 羧酸类化合物及衍生物
• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 有机碳酸及其衍生物
• 英文名称: europium carbonate
• 英文别名: Carbonic acid, europium(2+) salt (1:1)；europium(2+);carbonate
• CAS: 5772-74-7
• 化学式: CO₃*Eu
• 分子量: 211.969
• InChiKey: SULCVUWEGVSCPF-UHFFFAOYSA-L

计算性质

• 辛醇/水分配系数(LogP)：
  -2.45
• 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：
  63.2
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  4-氧代-1,4-二氢-2,6-吡啶二甲酸 、 europium carbonate 生成 Eu(cda)3(6-)
  参考文献：
  名称：

  立体化学不稳定的金属络合物在激发态下的手性动力学。水和水-d2中的三（quench），（6-）的对映异构体相互转化动力学，对映选择性猝灭和手性

  摘要：

  DOI：

  10.1021/j100381a037
• 作为产物：
  描述：

  europium(III) malonate * 6H2O 以 neat (no solvent) 为溶剂， 生成 europium carbonate
  参考文献：
  名称：

  镧系元素(III)草酸盐与丙二酸盐的热分解反应对比研究

  摘要：

  摘要 Eu2ox3·10H2O 和Eu2mal3·6H2O [ox 和mal = (COO-)2 和CH2(COO-)2] 的TG-DTA 分析在N2、O2 和CO2 气氛中进行。每个 TG 阶段的产物都是根据红外光谱确定的。X 射线衍射图、逸出气体分析和元素分析。在 N2 中，EU2ox3 和 Eu2mal3 的分解过程非常相似，并通过中间形成 Eu(II) 进行，在 Eu2ox3 的情况下，EuCO3 被确认为 EuCO3 的形式。另一方面，在 CO2 中，两种盐的分解过程不同；Eu2ox3 的表示为：Eu2ox3 → EuCO3 → Eu2O2CO3 → Eu2O3，而 Eu2mal3 的表示可暂定如下： Eu2mal3 → EuCH(COO)2 → Eu2O(CO3)2 → Eu2O2CO3 → Eu2O3。

  DOI：

  10.1016/0040-6031(91)80104-q

文献信息

• Color tuning and energy transfer investigation in Na2Ca4Mg2Si4O15:Eu2+, Mn2+ phosphor and its potential application for UV-excited UV-WLEDs
  作者：Wenzhen Lv、Yongchao Jia、Qi Zhao、Mengmeng Jiao、Baiqi Shao、Wei Lü、Hongpeng You

  DOI：10.1039/c3ra46474a

  日期：——

  In this paper, a novel single-phased white light emitting phosphor Na2Ca4Mg2Si4O15:Eu2+, Mn2+ was prepared successfully via the high temperature solid state reaction. The obtained Na2Ca4Mg2Si4O15:Eu2+ phosphor exhibits a broad excitation band ranging from 200 to 450 nm and a blue light emission band peaking at 480 nm, originating from 4f7 ↔ 4f65 d1 (f-d) electric dipole allowed transitions of Eu2+ ions. Due to the energy transfer from Eu2+ to Mn2+ ions, the co-doped Eu2+ ions in the Na2Ca4Mg2Si4O15:Eu2+, Mn2+ phosphors markedly enhances the luminescence intensity of Mn2+ ions, providing highly attractive tunable color. The luminescent mechanism invoking the energy transfer between Eu2+ ions and Mn2+ ions has been certified to be dipole–quadrupole interaction predominantly through the investigations of the luminescence spectra and the fluorescence decay curves. Our results show that the novel Na2Ca4Mg2Si4O15:Eu2+, Mn2+ phosphor is a very promising candidate for UV white light emitting diodes.

  本文通过高温固态反应成功制备了一种新型单相白光发光荧光粉Na2Ca4Mg2Si4O15:Eu2+, Mn2+。得到的 Na2Ca4Mg2Si4O15:Eu2+ 荧光粉具有 200 至 450 nm 的宽激发带和峰值为 480 nm 的蓝光发射带，这源于 Eu2+ 离子的 4f7 ↔ 4f65 d1 (f-d) 电偶极允许跃迁。由于 Eu2+ 离子向 Mn2+ 离子的能量转移，Na2Ca4Mg2Si4O15:Eu2+, Mn2+ 荧光粉中的共掺杂 Eu2+ 离子显著增强了 Mn2+ 离子的发光强度，提供了极具吸引力的可调颜色。通过对发光光谱和荧光衰减曲线的研究，证明 Eu2+离子和 Mn2+离子之间的能量转移发光机制主要是偶极-四极相互作用。我们的研究结果表明，新型 Na2Ca4Mg2Si4O15:Eu2+, Mn2+ 荧光粉是一种非常有前途的紫外白光发光二极管候选材料。
• Preparation and Crystal Chemistry of Divalent Europium Compounds
  作者：M. W. Shafer

  DOI：10.1063/1.1714142

  日期：1965.3

  indicated that the rock salt phase can accommodate about 4 mole% trivalent europium in solid solution at 1300°C. Very little (<1%) europium metal was found to go into the EuO phase, but by the addition of 5% to 7% the paramagnetic Curie temperature θ was increased from 73° to 79°K.A number of new divalent europium compounds have been prepared and their magnetic properties investigated. Ferromagnetism

  铕硫属元素化物是一组特别简单和重要的磁性材料的发现导致对这些材料的合成进行了大量工作。已经研究了几种制备纯 EuO 的方法，并报告了结果。产生最佳 EuO 的方法是将过量的铕金属与 Eu2O3 在 800°C 下反应，然后在 1150° 下在高真空下蒸馏掉。化学分析、微观结构和磁化测量用于确定作为温度函数的 EuO 的化学计量。结果表明，岩盐相在 1300°C 时可容纳约 4 摩尔％的三价铕固溶体。发现很少 (<1%) 铕金属进入 EuO 相，但是通过添加 5% 到 7%，顺磁性居里温度 θ 从 73° 增加到 79°KA 已经制备了许多新的二价铕化合物并研究了它们的磁性。铁磁性被发现在...
• Solution X-ray Absorption Fine Structure Study of the Eu²⁺ and Sr²⁺ Ions:  Unexpected Solvent and Metal Ion Dependencies of the Solvation Numbers
  作者：Gilles Moreau、Rosario Scopelliti、Lothar Helm、Juris Purans、André E. Merbach

  DOI：10.1021/jp026061w

  日期：2002.10.1

  Reference LCIB-ARTICLE-2002-012View record in Web of Science Record created on 2006-02-15, modified on 2016-08-08

  参考 LCIB-ARTICLE-2002-012查看 Web of Science 中的记录 记录创建于 2006-02-15，修改于 2016-08-08
• Nuclear and Electronic Relaxation of Eu²⁺₍_a_q):  An Extremely Labile Aqua Ion¹
  作者：Peter Caravan、Éva Tóth、Antal Rockenbauer、André E. Merbach

  DOI：10.1021/ja992264v

  日期：1999.11.1

  variable-pressure (9.4 T) 17O nuclear relaxation rates were measured for the Eu(II) aqua ion. Variable-temperature 1H nuclear magnetic relaxation dispersion (NMRD) profiles were recorded. In addition, EPR spectra of the Eu(II) aqua ion are reported as a function of temperature at 0.34, 2.7, 5.4, and 8.1 T. The simultaneous fit of the nuclear and electronic relaxation rate data results in kex298 = 4.4

  测量了 Eu(II) 水离子的变温 (4.7 和 9.4 T) 和变压 (9.4 T) 17O 核弛豫率。记录了变温 1H 核磁弛豫色散 (NMRD) 曲线。此外，Eu(II) 水离子的 EPR 谱被报告为 0.34、2.7、5.4 和 8.1 T 的温度函数。核和电子弛豫率数据的同时拟合导致 kex298 = 4.4 × 109 s -1 表示活化参数 ΔH⧧ = 15.7 kJ mol-1 和 ΔS⧧ = -7.0 J K-1 mol-1 的水交换率，ΔV⧧ = -11.3 cm3 mol-1 表示交换的活化体积，以及对于旋转相关时间，τR298 = 16.3 ps。Eu2+(aq) 的水交换通过一种缔合机制发生，并且具有通过磁共振在水离子中测量到的最高速率。高场 EPR 光谱，
• Unexpected Differences in the Dynamics and in the Nuclear and Electronic Relaxation Properties of the Isoelectronic [Eu^II(DTPA)(H₂O)]³^- and [Gd^III(DTPA)(H₂O)]²^- Complexes (DTPA = Diethylenetriamine Pentaacetate)¹
  作者：Sabine Seibig、Éva Tóth、André E. Merbach

  DOI：10.1021/ja9937829

  日期：2000.6.1

  The [Eu-II(DTPA)(H2O)](3-) complex (DTPA = diethylenetriamine pentancetate) has been prepared by controlled potential coulometry from [Eu-III(DTPA)(H2O)](2-). [Eu-II(DTPA)(H2O)](3-) is less stable toward oxidation than Eu-(aq)(2+), as shown by its more negative redox potential (E-1/2 = -1.34 V in comparison to E-1/2 = -0.61 V vs calomel electrode, respectively). Nevertheless, the rate of oxidation was found to be reasonably slow in highly concentrated solutions. Variable-temperature and -pressure, multiple-field O-17 NMR and nuclear magnetic relaxation dispersion (NMRD) measurements have been performed on [Eu-II(DTPA)(H2O)](3-) in aqueous solution. The water-exchange rate (k(ex)(298) = 1.3 x 10(9) S-1) is 3 orders Of magnitude higher than that on the corresponding Gd(mj complex, and it is only slightly smaller than that on the Eu(II) aqua ion. The positive activation volume (Delta V-double dagger = +4.5 cm(3) mol(-1)) indicates a dissociatively activated water-exchange process. The rotational correlation time is slightly longer for [Eu-II(DTPA)(H2O)](3-) as compared to that for [Gd-III(DTPA)(H2O)](2-), which is explained by the higher number of water molecules hydrogen-bended to the carboxylates of the ligand in the highly charged Eu(II) chelate. The electronic relaxation parameters obtained from NMRD and low-field transverse O-17 relaxation rates indicate that electron spin relaxation is considerably faster on [Eu-II(DTPA)((HO)-O-2)](3-) than on EU(aq)2+ or on the isoelectronic [Gd-III(DTPA)(H2O)](2-). Possibilities to use Eu-II complexes as MRI contrast agents are discussed.