Photosensitivity in the uncatalyzed CHD–bromate Belousov–Zhabotinsky reaction revealed by ESR spin trapping
Issued Date
2026-01-01
Resource Type
ISSN
00092614
Scopus ID
2-s2.0-105020853419
Journal Title
Chemical Physics Letters
Volume
882
Rights Holder(s)
SCOPUS
Bibliographic Citation
Chemical Physics Letters Vol.882 (2026)
Suggested Citation
Kheowan O.U., Maneedul W., Motina W., Bunchuay T., Pornsuwan S. Photosensitivity in the uncatalyzed CHD–bromate Belousov–Zhabotinsky reaction revealed by ESR spin trapping. Chemical Physics Letters Vol.882 (2026). doi:10.1016/j.cplett.2025.142490 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114339
Title
Photosensitivity in the uncatalyzed CHD–bromate Belousov–Zhabotinsky reaction revealed by ESR spin trapping
Author(s)
Author's Affiliation
Corresponding Author(s)
Other Contributor(s)
Abstract
Photo-addressable chemical oscillators convert light into time-resolved chemical and electrical outputs. We show that the uncatalyzed 1,4-cyclohexanedione–bromate BZ (CHD–BZ) reaction is light responsive via a radical generated pathway. The ESR spin trap (DMPO) reveals an atypical nitroxide pattern (β-H ≈ 0.3 mT) consistent with acid-promoted DMPO ring opening; ESR intensity follows the bromide oscillation. A brief visible pulse reproducibly increases [Br<sup>−</sup>] and amplifies the nitroxide signal ∼3 times. Substitution of CHD to 1,4-hydroquinone reproduces light-only features, and raises Br<sup>−</sup> intensity, supporting a photoactivated, radical-mediated route involving the H₂Q/ semiquinone couple. CHD–BZ serves as a photosensor with phase or ESR-amplitude readouts.