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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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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,...
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Deactivation Processes: Jablonski Diagram01:25

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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,...
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Updated: Jan 8, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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ひねりのある励起子トラッピング

Chinju Govind1, Israa Shioukhi2, Yinon Deree2

  • 1Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet CH-1211 Geneva 4 Switzerland eric.vauthey@unige.ch.

Chemical science
|December 22, 2025
PubMed
まとめ

ドナー・アクセプター分子の芳香族コアのひねりは、三重項収率と励起子トラッピングを向上させる。この歪みは、分岐間の結合を減らすことによって、共役系における電子励起の局在を制御する。

キーワード:
励起子トラッピング三重項収率芳香族コアドナー・アクセプター分子励起状態分子歪み電子励起局在共役系

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科学分野:

  • 光化学
  • 有機エレクトロニクス
  • 材料科学

背景:

  • ドナー・アクセプター（D-A）分子は、オプトエレクトロニクスにおいて重要である。
  • D-A分子の性能は、サブユニットの配向に敏感である。
  • D-A分子の励起状態に対する芳香族コアの曲率の影響は、十分に調査されていない。

研究 の 目的:

  • 対称的な二重分岐D-π-A分子における芳香族コアのひねりの効果を調査すること。
  • 分子歪みが励起状態の特性とダイナミクスにどのように影響するかを理解すること。
  • 電子励起の局在を制御する手法として歪みを模索すること。

主な方法:

  • 対称的な二重分岐D-π-A分子の計算モデリング。
  • 励起状態の特性（キラル応答や三重項収率を含む）の解析。
  • 励起状態対称性破壊（ESSB）と励起子ダイナミクスの調査。

主要な成果:

  • 分子のひねりは三重項収率を増加させ、励起状態対称性破壊（ESSB）を強化する。
  • 歪みは分岐間の結合を減少させ、単一のD-π-A分岐への励起子トラッピングを促進する。
  • ESSB後の溶媒和エネルギー要求の減少により、励起子トラッピングは極性の低い溶媒で発生する。

結論:

  • 芳香族コアの歪みは、D-A系の励起状態の挙動を調整するための実行可能な戦略である。
  • ひねりにより、電子励起の局在と励起子ダイナミクスの制御が可能になる。
  • これにより、先端的な共役材料のための新しい設計原理が提供される。