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関連する概念動画

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,...
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...
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...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.

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関連する実験動画

Updated: Jul 12, 2026

Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins
08:04

Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins

Published on: January 26, 2019

スピン・クロスオーバーは,連鎖の超分子系において起こる.

J A Real, E Andrés, M C Muñoz

    Science (New York, N.Y.)
    |April 14, 1995
    PubMed
    まとめ

    研究者らは,新種の鉄化合物を合成し,100~250Kの間のスピンクロスオーバー行動を示した.この発見は,高度な分子スイッチや電子機器の開発の鍵となる.

    科学分野:

    • 協調化化学について
    • マテリアルサイエンス 材料科学
    • 固体物理 固体物理学

    背景:

    • スピン・クロスオーバー (SCO) 材料は,分子スイッチや電子機器の開発に不可欠です.
    • 構造と磁気特性の相互作用を理解することは,効果的なSCO材料の設計に不可欠です.

    研究 の 目的:

    • 潜在的なスピンクロスオーバー特性を持つ新しい鉄 (((II) 調整化合物を合成し,特徴づけること.
    • 合成された化合物の構造的および磁気的振る舞いを調査するために.

    主な方法:

    • 構造的決定のためのX線単結晶 difraktion.
    • 温度変数磁気感受性の測定. 温度変数磁気感受性の測定.
    • 電子状態分析のためのモースバウアー光譜法.

    主要な成果:

    • 化合物は [Fe () () () () () () () ()) ]である. CH(3) OHが成功して合成され,構造的に特徴づけられました.
    • 結晶構造は,正方形のチャネルを形成する2つの垂直の2Dネットワークを明らかにします.
    • 変動温度の研究では,低スピンから高スピンまでのクロスオーバー行動が100〜250Kの間で確認されました.

    さらに関連する動画

    Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures
    08:02

    Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures

    Published on: May 31, 2024

    Cargo Loading onto Kinesin Powered Molecular Shuttles
    09:00

    Cargo Loading onto Kinesin Powered Molecular Shuttles

    Published on: November 3, 2010

    関連する実験動画

    Last Updated: Jul 12, 2026

    Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins
    08:04

    Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins

    Published on: January 26, 2019

    Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures
    08:02

    Synthetic Condensates and Cell-Like Architectures from Amphiphilic DNA Nanostructures

    Published on: May 31, 2024

    Cargo Loading onto Kinesin Powered Molecular Shuttles
    09:00

    Cargo Loading onto Kinesin Powered Molecular Shuttles

    Published on: November 3, 2010

    結論:

    • 結合された構造データと磁気データは,スピンクロスオーバーメカニズムに関する基本的な洞察を提供します.
    • この化合物の性質は,分子電子やセンシングデバイスの応用に有望である.