美国 (III) 和新 (III) 单基酸盐复合物的比较
Daniela Gomez Martinez1, Joseph M Sperling1, Nicholas B Beck1
1Department of Chemistry and Nuclear Science and Engineering Center, Colorado School of Mines, Golden, Colorado 80401, United States.
Inorganic chemistry
|May 9, 2024
概括
混合供体连接物有助于将三价性活性化物,如美洲 (Am3+) 与化物分离. 这项研究揭示了降解联体与Am3+与Neodymium (Nd3+) 的结合方式的微妙差异,影响了核燃料回收策略.
科学领域:
- 核化学 核化学 核化学
- 材料科学 材料科学 材料科学
- 协调化学 协调化学
背景情况:
- 混合供体配体 (O/N,O/S) 对于在核燃料回收过程中选择性地将三价活性化物 (Am3+,Cm3+) 与化物分离至关重要.
- 滴酸盐的降解产生单酸盐,产生O/S供体配体,对金属结合有潜在的影响.
研究的目的:
- 为了研究和比较单一酸配体与 (Nd3+) 和美洲 (Am3+) 的结合相互作用.
- 了解压力如何影响这些金属复合物的结构和光谱特性.
主要方法:
- 合成和单晶X射线衍射的[M(OPS(OEt) 2) 5(H2O) 2]2-复合体 (M = Nd3+,Am3+).
- 光学光谱学和钻石形细胞技术用于研究高达14GPa的压力下的复合物.
- 分析M-O和M-S键距离和压力诱导的光谱变化.
主要成果:
- 虽然Nd3+和Am3+具有相似的离子半径,但发现复合体中的M-S键距离在统计上是不同的.
- 在Nd3+和Am3+复合体中的光谱过渡显示出明显的压力依赖 (Nd3+的-11厘米-1/GPa,Am3+的-13厘米-1/GPa).
- 在高压下Am3+ 5f-5f过渡的扩大表明与Nd3+相比,5f轨道参与结合的增加.
结论:
- 这项研究强调了Am3+和Nd3+复合体与单基酸盐之间的协调环境和电子结构的微妙但显著的差异.
- 这些发现对于优化核燃料再加工中的溶剂提取过程,特别是关于降解的提取剂的行为,是很重要的.
- 在Am3+结合中增加的5f轨道参与可能会影响分离效率.
更多相关视频
13:21Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
15.0K
07:52A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
Published on: April 12, 2017
12.8K
相关概念视频
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
01:19Complexation Equilibria: The Chelate Effect
505
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
505
01:22EDTA: Chemistry and Properties
1.9K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
1.9K
00:43Complexometric Titration: Ligands
946
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
946
02:54Coordination Compounds and Nomenclature
21.3K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
21.3K