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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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

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Related Experiment Video

Updated: Jun 29, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Reversible and tunable photochemical switch based on plasmonic structure.

H Mbarak1,2, R Taheri Ghahrizjani1, S M Hamidi3

  • 1Laser and plasma Research Institute, Shahid Beheshti University, G. C. Tehran, Iran.

Scientific Reports
|March 22, 2020
PubMed
Summary

Pyranine (HPTS), a photoacid, enables active plasmonic control by optically modulating plasmon resonances. This light-driven system offers tunable, reversible control for plasmonic sensors and circuits.

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Area of Science:

  • Plasmonics
  • Photochemistry
  • Materials Science

Background:

  • Active plasmonic control is crucial for advanced optical devices.
  • Pyranine (8-hydroxypyrene-1,3,6-trisulfonate, HPTS) possesses unique photophysical and photochemical properties.
  • HPTS can function as a photoacid, enabling light-induced property changes.

Purpose of the Study:

  • To investigate pyranine (HPTS) for active plasmonic control.
  • To demonstrate HPTS as an optically controllable medium for modulating plasmon resonances.
  • To explore HPTS-coated 2D-plasmonic gratings for sensing applications.

Main Methods:

  • Fabrication of 2D-plasmonic gratings coated with HPTS thin films.
  • UV irradiation to induce excited-state proton transfer (ESPT) in HPTS.
  • Monitoring plasmon resonance shifts and fluorescence emission.

Main Results:

  • UV light switching on/off induced reversible plasmonic redshift via HPTS's refractive index variation.
  • HPTS thin films on 2D-plasmonic gratings showed emission-based responses to water vapor.
  • The system demonstrated tunable and reversible light-driven modulation of plasmonic properties.

Conclusions:

  • HPTS is a viable photoacid for active plasmonic control.
  • The developed system enhances active plasmonic structures.
  • Potential applications include biochemical optical sensors and all-optical plasmonic circuits.