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相关概念视频

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Valence Bond Theory02:42

Valence Bond Theory

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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
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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.3K
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...
26.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.0K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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相关实验视频

Updated: Jun 17, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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一个多铁子旋转交叉分子晶体.

Yong Ai1, Zhao-Bo Hu2, Yan-Ran Weng1

  • 1Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
|August 6, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新型分子晶体,1-F,同时表现出铁电,铁弹性和旋转交叉 (SCO) 行为. 这种突破性的多铁性SCO材料为先进的智能设备开辟了新的途径.

关键词:
铁弹性是一种铁弹性.铁电是铁电的发电源.分子铁电器分子铁电器.多种铁族的多铁族.旋转十字路口 旋转十字路口

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相关实验视频

Last Updated: Jun 17, 2025

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

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 分子电子学分子电子学

背景情况:

  • 旋转交叉 (SCO) 材料为先进的应用提供可调节的特性.
  • 结合铁电和SCO的双功能开关非常受欢迎,但在多铁晶体中很少实现.
  • 具有SCO行为的分子多铁素尚未得到充分探索.

研究的目的:

  • 合成和描述一种具有铁电性,铁弹性和SCO行为的新型分子多铁晶体.
  • 调查替代对相位过渡温度和多铁素性质的影响.
  • 建立了第一个具有多铁特性的分子SCO晶体.

主要方法:

  • 合成Fe(II) 晶体复合体 [FeII(C8-F-pbh) ] (1-F).
  • 使用温度依赖测量的相位过渡的表征.
  • 通过域逆转和演变研究验证铁电和铁弹性质.
  • 对旋转过渡机制和d轨道配置的分析.

主要成果:

  • 首个分子多铁SCO晶体1-F已经成功合成.
  • 1-F 呈现 222F2 类型的铁电相变,与室温铁电相变,发生在 318 K.
  • 该材料在高和低旋转状态之间显示了旋转过渡,加上铁弹性.
  • 与原始化合物相比,替代显著增加了过渡温度.

结论:

  • 1-F 是第一个多铁SCO分子晶体的例子.
  • 在1-F中铁电,铁弹性和SCO行为的共存突出了其对多稳定性应用的潜力.
  • 这一发现为设计用于智能设备的新型分子材料铺平了道路.