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相关概念视频

Properties of Transition Metals02:58

Properties of Transition Metals

29.9K
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.
29.9K
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

65.1K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
65.1K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

97.7K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
97.7K
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

15.1K
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
15.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.9K
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...
30.9K

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相关实验视频

Updated: Feb 6, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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在过渡金属复合体中计算交换合常量与张量产品选择配置相互作用.

Arnab Bachhar1, Nicholas J Mayhall1

  • 1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States.

Journal of chemical theory and computation
|February 4, 2026
PubMed
概括

我们介绍了Tensor产品选择配置交互 (TPSCI) 用于研究过渡金属复合体. TPSCI提供精确的磁交换合常量 (J) 和计算效率,为密度矩阵重规范化组 (DMRG) 提供了替代方案.

科学领域:

  • 量子化学是一种量子化学.
  • 计算材料科学 计算材料科学
  • 固态物理 固态物理

背景情况:

  • 过渡金属复合体由于部分填充的d轨道而表现出强烈的电子相关性,这对电子结构理论提出了挑战.
  • 对磁交换合常数 (J) 的准确计算对于理解和设计磁性材料至关重要.

研究的目的:

  • 为了比较一种新方法的性能,Tensor Product Selected Configuration Interaction (TPSCI),与已建立的密度矩阵重规范化组 (DMRG) 进行计算交换合常量.
  • 评估TPSCI对强度相关的过渡金属系统的优点和局限性.

主要方法:

  • 开发和应用使用局部相关的张量产品状态基础的张量产品选择配置交互 (TPSCI).
  • 对六种过渡金属复合体 (无核Cr,Fe,Mn和四核Ni-cubane) 的不同大小的活性空间进行了计算.
  • 将TPSCI结果与来自密度矩阵重规范化组 (DMRG) 的结果进行比较.

主要成果:

  • 由于局部集群状态的截断,TPSCI始终实现了比DMRG更高的波动能量.
  • 由TPSCI计算的磁交换合常量 (J) 通常在DMRG结果的10-30cm-1范围内.
  • TPSCI展示了直接J推断和计算效率的多状态能力的优势.

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相关实验视频

Last Updated: Feb 6, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

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The MultiBac Protein Complex Production Platform at the EMBL

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结论:

  • TPSCI是过渡金属复合物的电子结构计算的有希望的方法,提供了竞争力的准确性和效率.
  • 在TPSCI中,集群状态的截断是一个限制,需要仔细的融合测试和选择方案的潜在改进.
  • 需要进一步开发,包括分布式内存实现,以充分利用TPSCI对强烈相关的系统.