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相关概念视频

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...
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.
Metallic Solids02:37

Metallic Solids

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. Many...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

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相关实验视频

Updated: Jul 18, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

对于分层的[Fe(II) ((TCNE*-) ((NCMe) 2) +[Fe ((III) Cl4]- (TCNE =四乙烯) 观察到的磁性排序 (Tc = 90 K).

Konstantin I Pokhodnya1, Michael Bonner, Jae-Hyuk Her

  • 1Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA.

Journal of the American Chemical Society
|December 7, 2006
PubMed
概括

一种新的铁基磁铁[Fe(TCNE) ((NCMe) ][FeCl4],具有低于90K的铁磁性. 这种金属-TCNE磁铁具有直接的金属-链体结合和独特的旋转合单元.

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

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Last Updated: Jul 18, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 磁力学 磁力学 是一种

背景情况:

  • 金属有机框架 (MOF) 和协调聚合物因其磁性特性而被广泛研究.
  • 四乙烯 (TCNE) 是一种用于合成分子磁体的多功能连接物.
  • 了解结构属性关系对于设计新型磁性材料至关重要.

研究的目的:

  • 为了合成和表征一种新的金属-TCNE化合物.
  • 研究合成材料的磁性排序和结构性质.
  • 探索这种化合物作为一种新型铁磁材料的潜力.

主要方法:

  • 从TCNE和FeCl2的反应中分离[Fe(TCNE) ((NCMe) 2) [FeCl4]2.
  • 化合物的结构确定.
  • 测量磁感应度以确定排序温度和磁场行为.

主要成果:

  • 化合物[Fe{TCNE}{NCMe}2][FeCl4]已成功合成并进行结构特征.
  • 它表现出低于90K的铁磁顺序.
  • 该结构采用了一种新的平面mu4-[TCNE]*-旋转合单元,与四个Fe(II) 离子结合,具有直接的金属结合体结合.

结论:

  • [Fe ((TCNE)) ((NCMe)) [2][FeCl4]代表了第一个金属-TCNE磁铁,具有确定的结构和直接的金属结合体结合.
  • 这种化合物是新一类铁磁体的初始成员.
  • 该材料显示了显著的强制场 (1730 Oe) 和残余磁化 (7500 emuK/mol在50 K).