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

The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

43.7K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
43.7K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

980
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
980
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K

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

Polaron-mediated exciton dynamics of P(NDI2OD-T2) unveiled by transient absorption spectroscopy under electrochemical conditions.

The Journal of chemical physics·2026
Same author

Aligning Chemical Kinetics with Crystallization Enables Millimeter-Scale Single Crystals of Conductive MOFs.

Journal of the American Chemical Society·2026
Same author

Crystalline Small Molecule-Polymer Superlattice for Spatially Isolated Tetrathiafulvalene Spin Qubit Arrays.

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

Programming stacking order in conducting van der Waals metal-organic frameworks through ligand aggregation.

Nature chemistry·2026
Same author

A Vibrational Probe of Electrical Doping in N2200 and Fermi-Level Alignment at Polymer Cathode/Metal Cocatalyst/Electrolyte Junctions.

Journal of the American Chemical Society·2026
Same author

Dynamic Circular Sulfur-Rich Polymer Glasses From Elemental Sulfur.

Advanced materials (Deerfield Beach, Fla.)·2026
Same journal

Switching Site Selectivity in Alkoxyamine Hydration: From Lone-Pair Direction to Solvent Network Dominance.

Journal of the American Chemical Society·2026
Same journal

A Topotactic Leap: 2D Layers to 3D Large-Pore Zeolite.

Journal of the American Chemical Society·2026
Same journal

Enhanced Hydrogen Evolution over Single-Atom Catalysts via Electrostatic Polarization in Contact-electro-catalysis.

Journal of the American Chemical Society·2026
Same journal

Tumor Acidity-Activatable Ionizable Lipid Nanoparticles for Selective Oncolytic Therapy.

Journal of the American Chemical Society·2026
Same journal

Alternating Magnetic Field Promotes Ammonia Cracking by Disrupting the Sabatier Limitation of Ruthenium Catalytic Species.

Journal of the American Chemical Society·2026
Same journal

Bulk Ferromagnetic Icosahedral Quasicrystals without Rapid Quenching.

Journal of the American Chemical Society·2026
查看所有相关文章

相关实验视频

Updated: Aug 16, 2025

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

16.4K

在二维聚合物中排列的电子旋转位子候选物

Alexander K Oanta1, Kelsey A Collins1, Austin M Evans1

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois60208, United States.

Journal of the American Chemical Society
|December 27, 2022
PubMed
概括
此摘要是机器生成的。

研究人员将分子电子旋转量子位嵌入到二维聚合物 (2DPs) 中,控制它们的相互作用和连贯时间. 2DP中较低的自旋密度产生了更长的量子位放松时间,这对量子信息科学至关重要.

更多相关视频

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

10.0K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.7K

相关实验视频

Last Updated: Aug 16, 2025

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

16.4K
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

10.0K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.7K

科学领域:

  • 量子信息科学
  • 材料科学
  • 化学学

背景情况:

  • 由于化学工程, 分子电子自旋量子比特对量子信息具有前景.
  • 二维聚合物 (2DP) 提供了一个控制量子位间相互作用和连贯时间的平台.
  • 对量子位属性的系统控制对于技术应用至关重要.

研究的目的:

  • 将电子自旋量子位引入二磁二极管.
  • 分析旋转密度对量子比特特性和相互作用的影响.
  • 研究2DPs在工程量子信息应用中的潜力.

主要方法:

  • 在2DP中使用甲二胺子单元与甲 (CoCp) 的兴奋剂.
  • 定量电子磁共振 (EPR) 光谱分析旋转密度.
  • 在不同温度下测量旋转 (T1) 和旋转旋转 (T2) 放松时间.

主要成果:

  • 低旋转密度 (例如,6.0 × 1012旋转mm-3) 导致长的T1 (164 ms在10K到30.2μs在296K) 和T2 (2.36μs在10K到0.49μs在296K) 时间.
  • 由于交叉放松和旋声合,旋转密度和温度的增加减少了T1时间.
  • 较高的旋转密度减少了T2次,低密度的超细相互作用和高密度/温度的双极相互作用主导了脱凝.

结论:

  • 在2DP中分散电子自旋量子比特可以对量子比特之间的相互作用进行化学控制.
  • 旋转密度是一个关键参数,用于调整基于2DP的量子比特中的旋转脱时间.
  • 这种方法证明了用于量子技术的2DP分子自旋量子位的可行策略.