Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

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

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

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...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

An interpretable predictive model for depression risk in diabetic patients: A web-based application using NHANES data.

Medicine·2026
Same author

NIR-responsive MnO<sub>2</sub>-functionalized mesoporous silica hydrogel: Fabrication and antibacterial activity evaluation.

Talanta·2026
Same author

Comprehensive Analysis and Prognostic Modeling of Epithelioid Trophoblastic Tumor.

Obstetrics and gynecology·2026
Same author

Aptamers: Current Applications in Leukemia Diagnostics and Therapeutics.

Nucleic acid therapeutics·2026
Same author

Disintegrated halophilic aerobic granular sludge restoration using zinc oxide nanoparticles: synergistic effects of fungal toxicity inhibition and extracellular polymeric substances production.

Bioresource technology·2026
Same author

Development of a Machine Learning‑Based Prognostic Model for Intermediate Trophoblastic Tumors: A Single-Center Study With Web-Based Tool Implementation.

JCO precision oncology·2026

関連する実験動画

Updated: May 30, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
11:44

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Published on: October 18, 2018

Ru2-ポリイネのフレームワーク内の電子結合の調節

Bin Xi1, Isiah P-C Liu, Guo-Lin Xu

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.

Journal of the American Chemical Society
|August 23, 2011
PubMed
まとめ

ヘクサトリエンによって橋渡しされたルテニウムジーマーが合成され,TCNEまたはコバルト複合体と反応した. ルテニウムの中心間の電子結合は,これらの反応によって調節され,その混合バレンスの性質に影響を与えました.

さらに関連する動画

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
09:17

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

関連する実験動画

Last Updated: May 30, 2026

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
11:44

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Published on: October 18, 2018

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
09:17

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

Published on: January 30, 2015

科学分野:

  • 無機化学 無機化学とは
  • マテリアルサイエンス 材料科学
  • 電気化学 電気化学について

背景:

  • ブリッジングリガンドを持つルテニウム基ジメは,電子的および光物理的性質が興味深い.
  • 混合バレンスのシステムにおける電子通信の理解は,高度な材料の開発に不可欠です.

研究 の 目的:

  • 1,3,5-hexatriyn-diyl.で橋渡しされた新しいルテニウムダイマーを合成し,特徴づけること.
  • テトラシアノエーテン (TCNE) とコバルト複合体添加がルテニウム中心間の電子結合に及ぼす影響を調査する.

主な方法:

  • ルテニウムジメルの合成 ([ Ru 2 Xap 4 2 μ-C 6 ])
  • テトラシアノエーテン (TCNE) とコバルト複合体 (Co(2) (((dppm) (((CO) ((6)) との反応)
  • ヴォルタメトリックとスペクトロ電気化学の研究
  • X線微分分析によるX線微分分析
  • スピン無制限のDFT計算

主要な成果:

  • 1,3,5-hexatriyn-diyl.ylによって橋渡しされたルテニウムダイマーの合成が成功しました.
  • コバルト複合体によるTCNEと η(2) -Co(2) アドクトによるサイクル添加/挿入製品の形成.
  • 親化合物のルテニウムジメは,有意な電子結合 (ロビン・デイクラスII/III) を表している.
  • 電子結合はコバルト添加物で弱まり,TCNE挿入時に完全に除去されます.

結論:

  • これらの二次体内のルテニウム中心間の電子結合は,化学的改変によって効果的に調節することができます.
  • TCNEの挿入は電子通信を大幅に妨害し,コバルトの複合は適度な衰弱を引き起こす.
  • 構造的および計算的研究は,観察された電子結合の行動を支持する.