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Updated: Jul 11, 2025

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

Published on: September 12, 2014

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一种自组装诱导的激发物移位策略,用于将二胺衍生物从II型光敏剂转换为I型光敏剂

Lei Fang1, Rong Huang1, Wenqi Gong1

  • 1Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and Pharmaceutical Research Center, School of Chemistry and Chemical Engineering, Institution, Southeast University, Nanjing, 211189, China.

Small (Weinheim an der Bergstrasse, Germany)
|November 8, 2023
PubMed
概括

研究人员开发了一种新型二胺光敏感剂,可以在I型和II型光动力疗法 (PDT) 机制之间切换. 这种自组装策略增强了超氧化物生成,用于有效治疗癌症,即使在低氧环境中也是如此.

关键词:
激励子脱局部化 激发子脱局部化光动力学疗法是一种光动力学疗法.超分子自我组装的自我组装.一类I型的光敏感剂.

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Photochemical Electrocyclic Reactions: Stereochemistry

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.
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Thermal and Photochemical Electrocyclic Reactions: Overview

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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The Photochemical Reaction Center

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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Photosystem II

The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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