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関連する概念動画

Energy Diagrams, Transition States, and Intermediates02:13

Energy Diagrams, Transition States, and Intermediates

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Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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

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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.
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Cooperative Allosteric Transitions01:58

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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.4K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Updated: Feb 22, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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移行状態の特徴化のためのグラフベースの内部座標分析

Alister S Goodfellow1, Bao N Nguyen1

  • 1School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.

Journal of chemical theory and computation
|February 21, 2026
PubMed
まとめ
この要約は機械生成です。

GraphRCは,分子グラフからの内部座標を使用して,移行状態 (TS) モードを迅速に分析します. この方法は,初期および最終構造を必要とせずに反応経路の化学的洞察を提供します.

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Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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科学分野:

  • コンピューティング・ケミストリー
  • 化学動力学 化学動力学
  • 分子モデリング

背景:

  • トランジション状態 (TS) 分析は,化学反応を理解する上で極めて重要です.
  • 現在の方法は,しばしばカルテシアン座標に依存しており,結合変化の直接的な化学解釈を制限しています.
  • 内在反応座標 (IRC) と急速反応座標 (QRC) の計算は反応経路を追跡しますが,計算的に集中することができます.

研究 の 目的:

  • 移行状態 (TS) モードを分析するための迅速な方法を開発する.
  • 内部座標を用いた反応座標の化学的洞察を提供するため.
  • プログラムによるTS検証と分析を可能にする.

主な方法:

  • 分子グラフから得られた内部座標 (結合,角度,二面体) を利用した GraphRC 方法.
  • 分子接続性の決定のためのキシグラフを使用し,多様な化学構造で検証しました.
  • TSの仮想モードの分析と,IRC/QRCによるコネクティビティとの比較.

主要な成果:

  • GraphRCは,最初の検証で,債券の変更,回転,逆転の100%の識別を達成しました.
  • グラフRCとIRC,QRCの接続性を比較したところ,偽陽性ゼロが観察されました.
  • ノーマルモード分析だけで,テストされた395のすべてのTSでプライマリボンドの変化が検出され,IRCデータとよく一致しました.

結論:

  • GraphRCは,TSモードと反応座標の迅速かつ解釈可能な分析を提供します.
  • この方法は,反応物/産物構造の事前の知識なしに化学的洞察を提供します.
  • GraphRCは,費用対効果の高いプログラムによるTS検証を可能にすることで,厳格な計算を補完します.