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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...

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相关实验视频

Updated: Jul 12, 2026

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

平面三坐标高旋转Fe(II) 复合体具有很大的轨道角动量:Mössbauer,电子磁共振和电子结构研究研究.

Hanspeter Andres1, Emile L Bominaar, Jeremy M Smith

  • 1Departments of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA.

Journal of the American Chemical Society
|March 21, 2002
PubMed
概括

这项研究揭示了铁复合体中前所未有的超细磁场,为酶酶的电子结构提供了洞察力. 这些发现提升了我们对生物无机化学中自旋状态和轨道相互作用的理解.

更多相关视频

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

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

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

Published on: June 9, 2023

相关实验视频

Last Updated: Jul 12, 2026

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

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

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

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

Published on: June 9, 2023

科学领域:

  • 无机化学 无机化学 有机化学
  • 生物有机化学 生物有机化学
  • 量子化学 是一个量子化学.

背景情况:

  • 铁复合物与β-二甲基胺联体是理解金属酶的关键模型系统.
  • 对于固定至关重要的酶酶含有具有复杂电子结构的铁硫集群.

研究的目的:

  • 研究具有β-diketiminate连接体的新型铁 (II) 复合物的磁性和电子结构.
  • 为了阐明大磁场和未灭的轨道角矩的起源.
  • 为了解化酶Fe-Mo辅因子中铁位点的电子参数提供一个模型.

主要方法:

  • 在应用磁场 (高达8.0 T) 中,在可变温度 (4.2200 K) 的Mössbauer光谱学.
  • 电子偏磁共振 (EPR) 光谱在X频段.
  • 旋转哈密尔顿分析和晶体场理论.
  • 密度函数理论 (DFT) 的计算,包括时间依赖的DFT (TD-DFT).

主要成果:

  • 旋转S = 2系统具有单轴磁化和大的零场分裂 (>150厘米-1).
  • 史无前例的正磁场超精度 (高达+82 T) 和有效g值明显大于单独旋转 (g) =10.911.4).
  • 确定yz和z2 3d轨道状态之间的自旋轨道合,并确定晶体场的分裂 (例如,为1.Cl的~3500 cm-1).
  • 对电场梯度的连接体贡献显示了对轴联接体 (X) 的强烈依赖,揭示了二基酸比单酸捐赠体更少扰乱铁波功能.

结论:

  • 研究的铁复合体表现出独特的磁性和电子性质,包括异常大的超精细场.
  • 旋转轨道合在观察到的磁性行为和轨道贡献中起着重要作用.
  • 这些发现为化酶Fe-Mo辅因子的铁位点中观察到的电子参数提供了潜在的解释.