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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

12.3K
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...
12.3K
Valence Bond Theory02:42

Valence Bond Theory

9.1K
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...
9.1K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.4K
Diamagnetism01:26

Diamagnetism

2.5K
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....
2.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.3K
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...
27.3K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

946
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
946

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一种高性能单分子磁铁,使用二氨基化物联体

James C Vanjak1, Branford O Wilkins1, Veacheslav Vieru2

  • 1Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States.

Journal of the American Chemical Society
|September 26, 2022
PubMed
概括

研究人员开发了一种新型的同质性f-块化物三明治复合物,一种高性能单分子磁铁 (SMM). 这种复合物具有出色的磁性,包括66K的高阻温度,使其成为现有的最佳SMM.

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科学领域:

  • 协调化学
  • 材料科学
  • 磁性

背景情况:

  • 单分子磁铁对于先进的磁性数据存储和量子计算至关重要.
  • 开发具有高磁性异构性的f-块复合体仍然是一个重大挑战.
  • 化物配体为设计新型SMM提供了一个有前途的途径.

研究的目的:

  • 合成和表征第一个同质的f-块化物三明治复合物.
  • 评估合成复合物的磁性属性作为单分子磁体.
  • 在增强磁性异构性方面探索离子化物配体的潜力.

主要方法:

  • 聚甲基复合物的合成[1-甲基]-2,3,4,5-四甲基]2Dy] (1).
  • 使用X射线晶体学进行结构性表征,以确定金属-连接体的距离和线性.
  • 磁性测量,包括磁化逆转障碍 (Ueff) 和阻塞温度 (TB).

主要成果:

  • 复合物[K(2.2.2) ][[1-(piperidino) -2,3,4,5-tetraphenylborolyl]2Dy] (1) 已成功合成,代表了第一个同质的f-块化物三明治复合物.
  • 复合物1表现出一个离子Ln3+金属,在Dy3+离子周围具有短的金属连接键和高线性.
  • 实现了66K的高阻塞温度 (TB) 和显著的磁化逆转屏障 (Ueff = 1600 cm-1),将其归类为性能最高的SMM.

结论:

  • 在f-块复合体中,二基化物联体可以有效地增加联体场的轴性.
  • 这种方法最大限度地提高了磁性异构性,从而产生了高性能的SMM.
  • 复合物1显示了化物对SMM技术的重大潜力.