{
  "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.",
  "abstract_shown": true,
  "affiliations": [
    "Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee37831, United States.",
    "Department of Chemistry and Chemical Engineering, Florida Institute of Technology, Melbourne, Florida32901, United States."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Ying-Zhong Ma",
      "orcid": "0000-0002-8154-1006"
    },
    {
      "affs": [
        1
      ],
      "name": "Pavithra Liyanage",
      "orcid": "0009-0009-5818-1581"
    },
    {
      "affs": [
        1
      ],
      "name": "Yi Liao",
      "orcid": "0000-0002-8217-8202"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/er5qp2ttp1p8t.bib",
  "cited_by": 0,
  "doi": "10.1021/acs.jpclett.6c02370",
  "fulltext_url": "https://europepmc.org/articles/PMC13618034",
  "id": "er5qp2ttp1p8t",
  "issns": [
    "1948-7185"
  ],
  "landing_url": "https://europepmc.org/article/MED/42917867",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|Photochromic and Fluorescence Chemistry"
    ]
  ],
  "openalex": "W7212351211",
  "pdf_url": "https://europepmc.org/articles/PMC13618034?pdf=render",
  "pmcid": "PMC13618034",
  "pmid": "42917867",
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/er5qp2ttp1p8t.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:02Z",
      "native_id": "MED:42917867",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42917867"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Photochromic and Fluorescence Chemistry",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Activating Photoreaction of Indazole Metastable-State Photoacid through Two-Photon Excitation.",
  "title_text": "Activating Photoreaction of Indazole Metastable-State Photoacid through Two-Photon Excitation.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:21:02Z",
  "url": "https://research.draconitic.com/paper/er5qp2ttp1p8t",
  "venue": "The journal of physical chemistry letters",
  "versions": []
}