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相关概念视频

Properties of Transition Metals02:58

Properties of Transition Metals

29.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.7K
Hypersensitivities01:30

Hypersensitivities

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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Phase Transitions02:31

Phase Transitions

23.1K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.1K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

8.7K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.7K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.0K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.0K
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

20.0K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
20.0K

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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超敏感的f-f 兰化三化物复合物的过渡强度.

Hélène Bolvin1, Marion Luu1, Jean-Claude Bünzli2

  • 1Laboratoire de Chimie et Physique Quantiques, CNRS, Université Toulouse, 118 Route de Narbonne, Toulouse 31062, France.

Inorganic chemistry
|January 27, 2026
PubMed
概括

这项研究引入了一种计算方法,以准确预测兰坦化物复杂吸收光谱. 这种方法准确地模拟了过敏过渡,这对于理解兰坦化物化学中的联结体相互作用至关重要.

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科学领域:

  • * 计算化学 计算机化学
  • * 频谱学 是一种光谱学.
  • * 无机化学 无机化学

背景情况:

  • * 兰化物复合体表现出对连接体环境敏感的过敏过渡.
  • * 准确预测吸收光谱对于材料科学和化学应用至关重要.
  • *现有的方法可能无法完全捕捉电子和联结体效应的复杂相互作用.

研究的目的:

  • * 计算和分析兰化三化物复合物的吸收光谱.
  • *为了验证一个多配置的旋转轨道配置相互作用与二次扰动理论 (SO-CIS(PT2) 方法.
  • * 调查连接体对过敏过渡和贾德-奥菲尔特参数的影响.

主要方法:

  • * 采用多配置SO-CIS(PT2) 方法进行光谱计算.
  • * 考虑了旋转轨道合,动态电子相关性和合体-金属相互作用.
  • *从无旋转分流体中导出Judd-Ofelt参数来分析过渡性质.

主要成果:

  • *计算的光谱与过渡能量和强度的实验数据有很好的一致性.
  • *发现过敏过渡,主要是那些 ΔL = -2.2 的过渡.
  • * 贾德-奥菲尔特参数显示了整个化物和化物系列的可预测趋势.

结论:

  • * SO-CIS(PT2) 方法是一个可靠的工具,可以从第一原理中预测兰坦化物复合物吸收光谱.
  • *动态合模型提供了对光谱属性的微观理解.
  • *这些发现有助于设计具有量身定制光学性质的兰坦化物复合物.