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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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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...
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Valence Bond Theory02:42

Valence Bond Theory

8.4K
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...
8.4K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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相关实验视频

Updated: May 30, 2025

Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
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Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII

Published on: May 4, 2020

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铁复合体的基于投影仪的量子嵌入研究

Jonathan M Waldrop1, Ajay Panyala2, Daniel Mejia-Rodriguez2

  • 1Ames National Laboratory, Ames, Iowa, USA.

Journal of computational chemistry
|January 31, 2025
PubMed
概括
此摘要是机器生成的。

基于投影的嵌入理论 (PBET) 提供了一种具有成本效益的方法来计算铁复合体中的自旋交叉能量. 这种方法提高了大多数系统的准确性,显示了复杂分子研究的前景.

关键词:
密度函数理论密度函数理论嵌入式 嵌入式 嵌入式能源的能量是能量的能量.量子力学的量子力学是什么

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科学领域:

  • 计算化学是一种计算化学.
  • 量子化学是一种量子化学.

背景情况:

  • 旋转交叉 (SCO) 复合体在材料科学中至关重要.
  • 精确计算SCO能量的计算要求很高.
  • 含铁系统对电子结构计算提出了独特的挑战.

研究的目的:

  • 评估基于投影的嵌入理论 (PBET) 在计算旋转交叉能量方面的有效性.
  • 用各种波函数和DFT方法来评估PBET的性能.
  • 探索PBET作为SCO复合体规范计算的成本效益高的替代方案.

主要方法:

  • 使用PBET将Fe中心嵌入到冷的配体潜力中.
  • MP2,CCSD和CCSD (T) 方法被嵌入到SCAN和r2SCAN DFT潜力中.
  • 结果与正典计算和文献价值进行了比较.

主要成果:

  • 对于大多数含Fe的系统,PBET计算显示了与底层DFT相比的改善.
  • 由于波函数方法的局限性,PBET补偿了波函数方法的局限性,产生了与严格计算相比的结果.
  • 该方法与显示接近零的旋转交叉能量的系统作斗争.

结论:

  • PBET为研究旋转交叉复合体提供了一种务实且在计算上更便宜的方法.
  • 在DFT连接体场内的金属中心周围重新计算电子结构是一个有前途的策略.
  • 对于接近零的旋转交叉能量系统,需要进一步精细化.