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A spirocyclic BODIPY photosensitizer with pH-triggered triplet-state activation for tumor-selective photodynamic

Luying Guo1, Xing Guo1, Yiran Liu1

  • 1Key Laboratory of Functional Molecular Solids of Ministry of Education, Anhui Province Key Laboratory of Biomedical Materials and Chemical Measurement, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, China. guoxing@ahnu.edu.cn.

Chemical Communications (Cambridge, England)
|May 28, 2026
PubMed

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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.
Selection Rules: Photochemical Activation