ytterbium(III) trifluoroacetate

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: ytterbium(III) trifluoroacetate
• 英文别名: ytterbium trifluoroacetate；Yb(III) trifluoroacetate；ytterbium triflate；Yb(trifluoroacetate)₃；Yb(OTf)3
• 化学式: 3C₂F₃O₂*Yb
• 分子量: 512.088
• InChiKey: VIGZYVWURGVMIG-UHFFFAOYSA-M

计算性质

• 辛醇/水分配系数(LogP)：
  -0.7
• 重原子数：
  8.0
• 可旋转键数：
  0.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  40.13
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为反应物：
  描述：

  ytterbium(III) trifluoroacetate 、 lithium trifluoroacetate 在 oleic acid 、 1-octadecene 作用下， 以 neat (no solvent) 为溶剂， 生成
  参考文献：
  名称：

  衍生自三氟乙酸金属盐前体的旋光性均匀的钾和锂稀土氟化物纳米晶体。

  摘要：

  本文报道了具有不同形状（立方KLaF4和KCeF4蠕虫状纳米线，纳米立方体和纳米多面体;立方LiREF4（RE = Pr to Gd，Y）纳米多面体;通过在热油酸/油胺/ 1-中共同加热Li（CF3COO）或K（CF3COO）和RE（CF3COO）3共同热解四方LiREF4（RE = Tb对应Lu，Y）菱形纳米板）十八碳烯溶液。已经详细研究了溶剂组成，反应温度和时间对制备的纳米晶体的晶相纯度，形状和尺寸的影响。发现单分散纳米晶体的形成在很大程度上取决于从Li到K的碱金属以及从La到Lu和Y的稀土系列的性质。基于一系列的实验结果，还提出了一种受控增长机制。另外，评估了为设计的发光特性掺杂这些刚合成的主体纳米晶体的难易程度。例如，单分散和单晶掺杂Eu3 +的KGdF4，Yb3 +和Er3 +共掺杂的LiYF4纳米晶体重新分散在环己烷中，在紫外（UV）激发和近红外（NIR）980 nm激光激发下分别显示可见的室温红色和绿色发射。

  DOI：

  10.1039/b909145a
• 作为产物：
  描述：

  ytterbium(III) acetate 、 三氟乙酸 生成 ytterbium(III) trifluoroacetate
  参考文献：
  名称：

  Facile and efficient preparation of high-performance REBa2Cu3O7−x superconducting films through a novel fluorinated solution route

  摘要：

  REBa2Cu3O7-x (RE = Y, Gd, Yb) superconducting films were prepared through an advanced low-fluorine solution route. The precursor solution was prepared using fluorine-free copper and barium salts, and fluorine-contained rare earth salts. Metal fluorides and oxides were formed as intermediate phases in the precursor films, which were pyrolyzed at 400-500 degrees C. After reacting with water gases during the firing process at 800 C, the fluorides were transformed into the oxides, finally leading to the formation of superconducting REBa2Cu3O7-x,, (REBCO) phases. Due to the low-content of fluorine in the solution, high-rate production of REBCO films could be realized using this low-fluorine solution method. All the REBCO films had a good out-of-plane texture with a high critical transition temperature of more than 90 K and a critical current density of more than 2 MA/cm(2). (C) 2013 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jfluchem.2013.01.022
• 作为试剂：
  描述：

  ytterbium(III) trifluoroacetate 、 thullium(III) trifluoroacetate 、 sodium 2,2,2-trifluoroacetate 、 gadolinium(III) trifluoroacetate 在 十八碳烯 、 8-十六碳烯酸 、 oleylamine 、 ytterbium(III) trifluoroacetate 、 thullium(III) trifluoroacetate 、 sodium 2,2,2-trifluoroacetate 、 gadolinium(III) trifluoroacetate 作用下， 反应 1.0h， 生成
  参考文献：
  名称：

  选择性阳离子交换使具有不同结构的镧系元素核/壳纳米粒子的生长成为可能

  摘要：

  核/壳纳米结构可用于改善或集成多种功能，但仍仅限于具有同构核壳结构的同构。在这里，我们描述了一种选择性阳离子交换策略来构建具有不同结构的镧系元素核/壳纳米粒子。六边形 NaLnF4 是一种典型的光子转换材料，被选为生长立方 CaF2 壳以保护表面暴露的 Ln3+。Ca2+ 和 Na+ 之间的优先阳离子交换触发了表面六方到立方结构的演变，从而修复了单晶 CaF2 壳异质外延的大屏障。异质结构的 CaF2 壳大大增强了上转换发射，绝对量子产率从 0.2% 增加到 3.7%。此外，有利于抑制 Ln3+ 的界面扩散，以及 Ln3+ 从纳米颗粒泄漏到水系统。这些发现为制造异质结构的核/壳纳米粒子开辟了一条新途径，并且对调节各种性质具有指导意义。

  DOI：

  10.1021/jacs.7b11836

文献信息

• RARE EARTH-BASED NANOPARTICLE MAGNETIC RESONANCE CONTRAST AGENT AND PREPARATION METHOD THEREOF
  申请人：PEKING UNIVERSITY

  公开号：US20170196997A1

  公开（公告）日：2017-07-13

  A rare earth-based nanoparticle magnetic resonance contrast agent and a preparation method thereof are provided. The rare earth-based nanoparticle magnetic resonance contrast agent is rare earth-based inorganic nanoparticles having the surfaces coated with hydrophilic ligands. The rare earth-based nanoparticles are first obtained by a high-temperature oil phase reaction, and then the surfaces thereof are coated with hydrophilic molecules to obtain the rare earth-based nanoparticle magnetic resonance contrast agent. Compared with the existing clinical contrast agent, the magnetic resonance contrast agent of the present invention has a greatly improved relaxivity, a good imaging effect, a low required injection dose, and long in vivo residence time. In addition, the rigid structure of the inorganic nanoparticles can effectively reduce the leakage possibility of gadolinium ions.

  提供一种基于稀土的纳米颗粒磁共振造影对比剂及其制备方法。该基于稀土的纳米颗粒磁共振造影对比剂是表面涂覆有亲水性配体的稀土基无机纳米颗粒。首先通过高温油相反应获得这些基于稀土的纳米颗粒，然后将其表面涂覆亲水性分子以获得基于稀土的纳米颗粒磁共振造影对比剂。与现有的临床对比剂相比，本发明的磁共振造影对比剂具有大大提高的弛豫率、良好的成像效果、低的注射剂量要求和长的体内滞留时间。此外，无机纳米颗粒的刚性结构可以有效降低钆离子泄漏的可能性。
• Assembly of near infra-red emitting upconverting nanoparticles and multiple Gd(<scp>iii</scp>)-chelates as a potential bimodal contrast agent for MRI and optical imaging
  作者：Sophie Carron、Qiang Ying Li、Luce Vander Elst、Robert N. Muller、Tatjana N. Parac-Vogt、John A. Capobianco

  DOI：10.1039/c5dt00919g

  日期：——

  Linking multiple paramagnetic Gd(iii)-DO3A chelates to the surface of NaGdF₄:Yb³⁺,Tm³⁺upconverting nanoparticles resulted in an assembly that has favorable properties for MRI and OI.

  将多个顺磁性Gd(iii)-DO3A螯合物连接到NaGdF4:Yb3+,Tm3+表面，形成一个组装体，具有适用于MRI和OI的有利特性。
• High Nd(III)-Sensitizer Concentrations for 800 nm Wavelength Excitation Using Isotropic Core–Shell Upconversion Nanoparticles
  作者：Carina Arboleda、Sha He、Alexandra Stubelius、Noah J. J. Johnson、Adah Almutairi

  DOI：10.1021/acs.chemmater.8b04057

  日期：2019.5.14

  Upconverting nanoparticles (UCNPs) are potentially useful for biological applications, if they are capable of high-intensity emission. This requires the highest absorption efficiencies of wavelengths not absorbed or scattered by tissues. 800 nm is considered to be a “biobenign” wavelength because it effectively minimizes signal attenuation and reduces detrimental overheating, while maintaining deep tissue penetration. Neodymium (Nd3+) substitution for ytterbium (Yb3+) in lanthanide-based UCNPs successfully shifts  absorption from 980 nm to 800 nm, where water does not show absorption. High Nd3+ concentrations are desired because the more the sensitizer ions, the higher the absorption and thus the upconversion (UC) emission. However, high Nd3+-sensitized UCNPs, above 30 mol % Nd3+, have been limited because of lattice distortions observed in heavily doped core–shell nanoparticles (CS NPs). Here, we overcome this hurdle by introducing a tensile-strained NaLuF4 shell while still ensuring a complete and thicker isotropic shell. We report 50 mol % Nd3+-sensitized CS NPs that effectively release lattice strain between the core and shell. The doping concentration of 50 mol % Nd3+ provided 13-fold UC enhancement compared to CS NPs without Nd3+ in the shell, independent of the activators examined in this study. This exceptional enhancement in UC emission is due to the maintenance of structural uniformity. We demonstrate cell tolerability by PEGylating CS NPs and incubating the NPs with several cell types to show the potential for biological applications.

  上转换纳米粒子（UCNPs）如果能够实现高强度发射，就有可能用于生物应用。这就要求对不被组织吸收或散射的波长具有最高的吸收效率。800 纳米被认为是 "生物无害 "波长，因为它能有效地减少信号衰减，降低有害的过热现象，同时保持深层组织穿透。在以镧为基础的 UCNP 中，钕（Nd3+）替代镱（Yb3+），成功地将吸收从 980 纳米转移到 800 纳米，而水对该波长没有吸收。之所以需要高浓度的 Nd3+，是因为敏化剂离子越多，吸收率就越高，因此上转换（UC）发射也就越高。然而，由于在重度掺杂的核壳纳米粒子（CS NPs）中观察到的晶格畸变，30 mol % Nd3+ 以上的高 Nd3+ 敏化 UCNPs 一直受到限制。在这里，我们通过引入拉伸应变的 NaLuF4 壳来克服这一障碍，同时还确保了完整且较厚的各向同性壳。我们报告了 50 mol % Nd3+ 敏化 CS NPs，它能有效释放核心与外壳之间的晶格应变。与外壳不含 Nd3+ 的 CS NPs 相比，掺杂浓度为 50 摩尔% 的 Nd3+ 可使 UC 增强 13 倍，这与本研究中考察的活化剂无关。这种超常的 UC 发射增强是由于保持了结构的一致性。我们通过 PEG 化 CS NPs 并将其与多种类型的细胞培养，证明了细胞的耐受性，从而展示了其在生物应用方面的潜力。
• Synthesis of a novel bifunctional nanocomposite with tunable upconversion emission and magnetic properties
  作者：Qian Cheng、Yu Li、Shouxin Liu、Jiehe Sui、Wei Cai

  DOI：10.1039/c5ra21721k

  日期：——

  Fluorescent and magnetic bifunctional NaYF4:Yb/Er/Co nanoparticles were synthesized for the first time via a thermalysis method using oleic acid as capping ligand and octadecene as solvent. The effect of Co2+-codoped on the size evolution, crystal structure, UC emission and magnetic properties of NaYF4:Yb/Er nanoparticles was investigated in detail. XRD, EDS and XPS measurements revealed that Co2+ ions had been

  荧光和磁性双功能NaYF 4：Yb / Er / Co纳米粒子是通过热解法首次合成的，使用油酸作为封端配体，以十八碳烯为溶剂。详细研究了Co 2+掺杂对NaYF 4：Yb / Er纳米粒子的尺寸演化，晶体结构，UC发射和磁性能的影响。XRD，EDS和XPS测量表明，Co 2+离子已成功掺入NaYF 4中晶格在II价态存在于主晶格中。共掺杂不同浓度的Co离子不会改变六方相的结构。然而，通过用Co 2+ / Yb 3+ / Er 3+掺杂结构，六方NaYF 4：Yb / Er的绿色和红色上转换（UC）发射强度明显增强，并且不同数量的衰变时间明显延长三掺杂的Co 2+离子。发光增强应归因于Er 3+离子周围局部不对称的畸变。讨论了增强上转换发射的可能机制。更重要的是，由于掺杂了钴离子，NaYF 4纳米粒子在室温下也表现出顺磁性，而在低温下也表现出超顺磁性。因此，期望这些纳米晶体可用作光学生物成像
• Fabrication of a novel nanocomposite Ag/graphene@SiO₂–NaLuF₄:Yb,Gd,Er for large enhancement upconversion luminescence
  作者：Dongguang Yin、Xianzhang Cao、Lu Zhang、Jingxiu Tang、Wenfeng Huang、Yanlin Han、Minghong Wu

  DOI：10.1039/c5dt01059d

  日期：——

  Upconversion nanocrystals have a lot of advantages over other fluorescent materials.

  提高转换纳米晶体相比其他荧光材料有很多优点。