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Peer-reviewedCC BYThe journal of physical chemistry letters

Activating Photoreaction of Indazole Metastable-State Photoacid through Two-Photon Excitation.

  • Ying-Zhong Ma1
  • Pavithra Liyanage2
  • Yi Liao2
  1. 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States.
  2. 2Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, Florida32901, United States.
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Abstract

The photoreaction and functionalities of metastable state photoacids (mPAHs) have been examined almost exclusively through one-photon excitation so far. Here, we report two-photon excited fluorescence measurements on an aqueous solution of a highly water-soluble indazole mPAH. The readily observable fluorescence emission was found to not only follow the anticipated quadratic intensity dependence but also possess a sizeable two-photon absorption cross-section of ∼53 GM. The distinct time-resolved fluorescence decays and emission spectra observed upon one- and two-photon excitation offer indirect evidence for the activation of different isomers and their associated pathways in the respective photoreactions. Our findings pave a promising way of unlocking new functionalities and applications of these mPAHs that are inaccessible to one-photon excitation.

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Cite

BibTeXRIS
BibTeX
@article{ma2026activating,
  title = {{Activating Photoreaction of Indazole Metastable-State Photoacid through Two-Photon Excitation.}},
  author = {Ying-Zhong Ma and Pavithra Liyanage and Yi Liao},
  journal = {The journal of physical chemistry letters},
  year = {2026},
  month = sep,
  doi = {10.1021/acs.jpclett.6c02370},
  url = {https://europepmc.org/article/MED/42917867},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Activating Photoreaction of Indazole Metastable-State Photoacid through Two-Photon Excitation.
AU  - Ying-Zhong Ma
AU  - Pavithra Liyanage
AU  - Yi Liao
PY  - 2026
DA  - 2026/09/01
JO  - The journal of physical chemistry letters
DO  - 10.1021/acs.jpclett.6c02370
UR  - https://europepmc.org/article/MED/42917867
AB  - The photoreaction and functionalities of metastable state photoacids (mPAHs) have been examined almost exclusively through one-photon excitation so far. Here, we report two-photon excited fluorescence measurements on an aqueous solution of a highly water-soluble indazole mPAH. The readily observable fluorescence emission was found to not only follow the anticipated quadratic intensity dependence but also possess a sizeable two-photon absorption cross-section of ∼53 GM. The distinct time-resolved fluorescence decays and emission spectra observed upon one- and two-photon excitation offer indirect evidence for the activation of different isomers and their associated pathways in the respective photoreactions. Our findings pave a promising way of unlocking new functionalities and applications of these mPAHs that are inaccessible to one-photon excitation.
SN  - 1948-7185
ER  -