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Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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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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The Antenna Complex01:15

The Antenna Complex

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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

974
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
974
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
2.1K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

693
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
693

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関連する実験動画

Updated: Dec 10, 2025

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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ホスト・ゲスト・コンプレックス・メディエイト・スーパーモレキュラー・フォトン・アップコンバーション

Indranil Roy, Amine Garci, Yassine Beldjoudi

  • 1Institute of Molecular Design and Synthesis, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, 300072, China.

Journal of the American Chemical Society
|September 1, 2020
PubMed
まとめ

この研究は,効率的な光子向上変換のための宿主-ゲスト化学を用いた超分子向上変換を導入します. この新しい方法は,稀な溶液で動作し,既存の光子向上変換技術の限界を克服します.

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An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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関連する実験動画

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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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科学分野:

  • 超分子化学
  • フォト物理学
  • 材料科学

背景:

  • 低エネルギーフォトンを高エネルギーフォトンに変換することで バイオイメージングや太陽電池などのアプリケーションを可能にします
  • 既存のアップコンバージョン方法は,しばしば高濃度とレーザー電力を必要とし,その使用を制限しています.

研究 の 目的:

  • 宿主-ゲスト化学を用いた新種の超分子アップコンバージョン戦略を開発する.
  • このホスト・ゲストによるアップコンバージョンのアプローチの普遍性と利点を示す.

主な方法:

  • ホスト-ゲストの複合体とテトラケーションのホストとポーフィリンゲスト.
  • アップコンバージョンメカニズムを研究するために,一時的な吸収スペクトロスコーピー.
  • 密度関数理論の計算でメカニズムが確認される.

主要な成果:

  • ホスト・ゲスト複合体における三重融合アップコンバージョンが,稀な条件下で実証された (μM).
  • 複数のホスト-ゲストシステムで 超分子アップコンバージョン戦略を検証した.
  • 伝統的な方法と比較して,より低い濃度とレーザーパワーでアップコンバージョンを達成しました.

結論:

  • ホスト・ゲスト化学による超分子アップコンバーションは,既存の方法に多用途で効率的な代替手段を提供します.
  • このアプローチは,高濃度,高レーザーパワー,低光学浸透深さの制限を克服します.
  • この戦略は一般的で,フォトンアップコンバージョンのための新しいホスト・ゲスト複合体の設計に適用できます.