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相关概念视频

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.5K
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...
26.5K
Metallic Solids02:37

Metallic Solids

18.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.4K
Formation of Complex Ions03:45

Formation of Complex Ions

23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446

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相关实验视频

Updated: Jul 2, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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自相一致的卷积密度功能近似方法:在金属表面对吸附的应用.

Sushree Jagriti Sahoo1, Qimen Xu1,2, Xiangyun Lei3

  • 1Georgia Institute of Technology, Atlanta, GA.

Chemphyschem : a European journal of chemical physics and physical chemistry
|February 29, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的方法,在密度函数理论中创建交换相关性 (XC) 函数,超出标准的"雅各布梯子"方法. 这种新的技术使用卷积内核,并提供了一种有前途的方法,可以同时优化多种材料的性能.

关键词:
密度函数理论 密度函数理论交易所相关性 - 交易所相关性一般化梯度近似推算方法多极扩张的多极扩张.

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科学领域:

  • 计算化学计算化学
  • 材料科学 材料科学 材料科学
  • 量子力学就是量子力学.

背景情况:

  • 密度函数理论 (DFT) 依赖交换相关性 (XC) 函数来近似多电子相互作用.
  • 现有的XC函数在很大程度上遵循一种被称为"雅各布梯子"的等级方法.
  • 需要新的方法来构建XC函数,这些函数可以超越这种既定的层次结构.

研究的目的:

  • 引入一种使用卷积内核构建 XC 函数的新方法.
  • 开发一种超越"雅各梯子"等级制度局限性的方法.
  • 展示一个功能性的概念验证,PBEq,并展示其功能.

主要方法:

  • 开发了基于随意核的卷积和电子密度的XC函数.
  • 为这些新函数推导了变量导数,证明了与通用梯度近似 (GGA) 的一致性.
  • 实现并测试了一个概念验证函数,PBEq,它概括了PBE框架.

主要成果:

  • PBEq 函数允许在单一系统内空间分辨应用不同的 GGA,同时遵守 PBE 约束.
  • 分析突出了错误取消的意义和数据驱动功能设计中的XC潜力.
  • 对小分子,散装金属和表面催化剂的测试显示了优化多种属性的有希望的结果.

结论:

  • 拟议的卷积内核方法提供了一个可行的途径,可以构建超越"雅各布梯子"的XC函数.
  • 这种方法可以同时优化各种材料的性能.
  • 这些发现强调了这种方法在推进DFT计算和材料发现方面的潜力.