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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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Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
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...
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Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
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基于莱瓦米索尔的Co (II) 单离子磁铁

Soumava Biswas1, Lubomir Havlicek2,3, Ivan Nemec2,4

  • 1Dr. Vishwanath Karad MIT World Peace University Survey No, 124, Paud Rd, Kothrud, Pune, 411038, Maharashtra, India.

Chemistry, an Asian journal
|June 13, 2024
PubMed
概括

一个新的 (II) 复合物与levamisole表现出单离子磁铁行为. 强大的分子内相互作用和零场分裂有助于其磁性特性,显示了先进磁性应用的潜力.

关键词:
() 离子 (II) 离子莱瓦米索尔 (Levamoisole) 是一种磁性异构性是一种磁性异构性.一个单离子磁铁的磁铁.在 ab initio 的计算中,

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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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科学领域:

  • 协调化学 协调化学
  • 磁电化学 磁电化学 磁电化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 列瓦米索尔 (L) 作为一种用于合成金属复合物的新联体被探索.
  • 了解 (II) 复合物的磁性特性对于开发新的磁性材料至关重要.

研究的目的:

  • 为了合成和表征一种新的 (II) 复合物,使用levamisole作为配体.
  • 研究合成复合物的结构,电子和磁性特性.
  • 探索复合体作为单离子磁铁 (SIM) 的潜力.

主要方法:

  • 合成的 (II) 复合物[Co (NCS) 2 (L) 2) ] (1).
  • 单晶X射线衍射用于结构确定.
  • 分子中的原子量子理论 (QTAIM) 用于分析分子内部相互作用.
  • 直流 (dc) 磁性分析和ab initio联体场理论计算.
  • 动态磁化测量以研究磁性放松.

主要成果:

  • (II) 离子呈现出扭曲的四面体协调几何.
  • 确定了强大的分子内S⋅⋅⋅S和S⋅⋅⋅N相互作用.
  • 综合体显示零场分裂 (ZFS) 和显著的磁性异构性.
  • 观察到场诱导的单离子磁铁 (SIM) 行为,通过奥巴赫机制缓慢的磁性放松.

结论:

  • 合成的 (II) 复合体表现出有希望的单离子磁铁特性.
  • 内分子相互作用和ZFS在观察到的磁性行为中起着关键作用.
  • 该综合体显示出在分子磁力和自旋电子学中的应用潜力.