Related Experiment Video
Updated: Jun 6, 2026

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
Published on: February 7, 2022
A chemical oscillator based on the photoreduction of 2-methyl-1,4-benzoquinone
Takashi Amemiya1, Jichang Wang
1Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, 240-8501, Japan. amemiyat@ynu.ac.jp
Abstract:
This study investigated bromate-2-methyl-1,4-benzoquinone photoreaction in a batch reactor, in which the photoreduction of 2-methyl-1,4-benzoquinone plays a vital role in initiating and sustaining the reaction process. Transient oscillatory phenomena are observed over broad reaction conditions, but a phase diagram in the bromate and sulfuric acid concentration plane shows that the nonlinear behavior is more sensitive to the ratio of bromate and acid than their absolute concentrations. Light intensity and the photosensitive substance 2-methyl-1,4-benzoquinone exhibited opposite effects on the induction time of these oscillations, implying that illumination does more than just reduce 2-methyl-benzoquinone. The oscillatory behavior has been qualitatively reproduced with a generic model developed for bromate-aromatic compounds systems.
More Related Videos
Related Concept Videos
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Radical Chain-Growth Polymerization: Overview
The Photochemical Reaction Center
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Reactions at the Benzylic Position: Oxidation and Reduction
Thermal and Photochemical Electrocyclic Reactions: Overview
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
