Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K
Valence Bond Theory02:45

Valence Bond Theory

50.8K
Overview of Valence Bond Theory
50.8K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.6K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.6K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.8K
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...
1.8K
Colors and Magnetism03:02

Colors and Magnetism

14.3K
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...
14.3K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
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,...
1.5K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Two of a Kind: Composition and Photophysics of Two Silver Nanoclusters Stabilized by the Same DNA Sequence.

Journal of the American Chemical Society·2026
Same author

Metallaphosphinidene Coupling with a Phosphorus Ylide to Form a Phosphavinyl [P═CH<sub>2</sub>]<sup>-</sup> Ligand.

Journal of the American Chemical Society·2026
Same author

Persistent compensated ferrimagnetism in the molecular framework Cr(pyrazine)<sub>3</sub>.

Nature chemistry·2026
Same author

Giant Magnetostriction in Ferrimagnetic SmFe<sub>5</sub>As<sub>3</sub>.

Angewandte Chemie (International ed. in English)·2026
Same author

Stabilizing the EN triple bonds in pnictogen mononitrides.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

Interplay of Redox Non-Innocence and Symmetry Breaking in a 4d Coordination Framework.

Journal of the American Chemical Society·2026

相关实验视频

Updated: Mar 1, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
11:10

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

12.5K

一种混合和高旋转酸的酸.

Aswin Chandran1, Christian Sandoval-Pauker2, Balazs Pinter3

  • 1Department of Chemistry, Lund University, Naturvetarvägen 22, 22100 Lund, Sweden.

Journal of the American Chemical Society
|February 27, 2026
PubMed
概括

研究人员合成了一种新型的化复合物,具有独特的高旋转,混合价值结构. 这一发现为制造具有与固态材料相似性质的分子类似物打开了新的途径.

更多相关视频

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

12.1K
Fabrication of VB2/Air Cells for Electrochemical Testing
09:04

Fabrication of VB2/Air Cells for Electrochemical Testing

Published on: August 5, 2013

12.5K

相关实验视频

Last Updated: Mar 1, 2026

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
11:10

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

12.5K
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

12.1K
Fabrication of VB2/Air Cells for Electrochemical Testing
09:04

Fabrication of VB2/Air Cells for Electrochemical Testing

Published on: August 5, 2013

12.5K

科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 有机金属化学 有机金属化学

背景情况:

  • 具有高旋转配置的过渡金属化物很难作为分子类型合成.
  • 在分子系统中复制固态材料特性仍然是一个挑战.

研究的目的:

  • 为了合成一种新型的酸酸复合物.
  • 研究合成化合物的电子和结构性质.
  • 为了探索高旋转,混合价值酸结构的形成.

主要方法:

  • 通过化物转化合成一个V(III) 乙烯酸复合物的合成.
  • 体诱导的还原性消除和光解反应.
  • 使用振动,紫外线可见和X射线光谱学进行结构性表征.
  • 理论计算以了解电子结构和旋转状态.

主要成果:

  • 一个V(III) 氨酸复合物,[(pyrNdipp) 2V(PCO) ],被合成.
  • 暴露于连接物产生了V(II) 复合物.
  • 复合物V(III) 的光解产生了一种高旋转,混合价值的化,[(pyrNdipp) 2VPV(pyrNdipp) 2),具有[V2(III,IV) ]的核心.
  • 该结构表现出S4对称性和非局部化的混合价值描述.
  • 化具有高旋转,S_T = 3/2基态,由于弱联体场分裂,避免了旋转配对.

结论:

  • 一种新型高旋转,混合价值酸的合成证明了固态材料分子类型的新途径.
  • 这种独特的电子结构和自旋状态归因于特定的-结合和联体环境.
  • 这项工作提供了对过渡金属化物的基本化学和它们的潜在应用的洞察.