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Updated: Jun 26, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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在胆固醇附加的提亚-氨基基基基捐赠-接受系统中,分子内电荷转移和刺激响应的发射

Parappurath Athira1, Ramya Nelliyulla Kappumchalil1, Aditya Ramesh Sachin2,3

  • 1Department of Chemistry, Farook College (Autonomous), Affiliated to University of Calicut, Kozhikode 673632, Kerala, India.

The journal of physical chemistry. A
|May 14, 2024
PubMed
概括

两个新的胆固醇功能化的有机光分子,PTCS-1和PTCS-2,表现出聚合诱导的发射和机色发光. 它们的发射特性可以通过外部刺激来调整,显示可逆的晶体-无形状态转换.

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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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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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