Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Electron Affinity03:07

Electron Affinity

44.8K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
44.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.7K
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...
31.7K
Valence Bond Theory02:42

Valence Bond Theory

11.6K
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...
11.6K
Colors and Magnetism03:02

Colors and Magnetism

14.6K
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...
14.6K
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

67.8K
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...
67.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
49.6K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Tunable CO<sub>2</sub> Capture and Release Using Redox-Switchable Carboranes.

Journal of the American Chemical Society·2026
Same author

Activation of Dioxygen via Neodymium-Alkali Metal Clusters.

Journal of the American Chemical Society·2026
Same author

Photopatternable Thermochromism Enabled by an Anthracene Heterodimer Ligand.

Journal of the American Chemical Society·2026
Same author

Manipulating Terminal Iron-Hydroxide Nucleophilicity through Redox.

Journal of the American Chemical Society·2026
Same author

Challenges and Opportunities in PFAS Waste Management for Semiconductor Manufacturing.

Environmental science & technology·2026
Same author

A Redox-Tunable Carborane Crown: Toward Highly Selective Electrochemical Lithium Capture.

Chemistry (Weinheim an der Bergstrasse, Germany)·2025

相关实验视频

Updated: Mar 26, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

11.8K

在[Fe3]集群中最大化电子交换

Raúl Hernández Sánchez1, Amymarie K Bartholomew1, Tamara M Powers1

  • 1Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society
|January 23, 2016
PubMed
概括
此摘要是机器生成的。

一个三铁团的单电子减少会诱导连接物重新排列和Fe-Fe键收缩,形成一个稳定的S = 11/2旋转基态与缓慢的磁放松. 这表明集群内的电子移位和交换相互作用很强.

更多相关视频

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

9.0K
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K

相关实验视频

Last Updated: Mar 26, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

11.8K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

9.0K
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K

科学领域:

  • 无机化学
  • 磁化学
  • 材料科学

背景情况:

  • 三铁集群对其磁性和分子磁性的潜在应用很感兴趣.
  • 了解集群结构,电子配置和磁性行为之间的关系对于设计新的磁性材料至关重要.

研究的目的:

  • 研究一个电子减小对特定三铁集群的结构和磁性特性的影响.
  • 描述缩小集群的自旋基本状态和磁放松动态.

主要方法:

  • 通过X射线晶体学和磁性敏感度测量,合成和描述减少的三铁.
  • 使用了可变温度磁性敏感性,交替电流 (ac) 磁性敏感性和Mössbauer光谱学.
  • 磁性属性的计算分析,包括零场分裂参数.

主要成果:

  • 一个电子减少的 ((tbs) L) Fe3 ((thf) 产生的[M][(tbs) L) Fe3]与K+ counterions.
  • 连接体重新安排为C3对称,THF被排斥,Fe-Fe距离收缩.
  • 在室温下观察到稳定的S = 11/2旋转基本状态.
  • 缓慢的磁放松和超细的分裂表明在低温下旋转的动态很慢.
  • 对磁性数据的分析得出有效旋转逆转屏障 (U(eff)) 为22.6(2) cm−1.
  • 莫斯巴尔光谱显示了集群中的强烈电子移位.

结论:

  • 减少的三铁集群表现出强大的S = 11/2旋转基态和显著的连接物重新排列.
  • 强烈的双和直接交换相互作用有助于观察到的磁性.
  • 这些发现为单分子磁铁和分子磁性材料的设计提供了洞察力.