{
  "abstract": "The long term stability of conjugated fluorescent and photochromic compounds is essential for their application in materials and devices, but is often highly sensitive to changes in molecular structure. This aspect is particularly prominent in the 6'-nitro-spiropyran and 6'-nitro-spirothiopyran photochromes, which differ only in a O/S atom at the spiro center but show remarkably different stability under UV irradiation. Here, we show, using femtosecond and nanosecond transient absorption and NIR emission spectroscopy supported by quantum chemical calculations, that from a photo-physical and -chemical perspective the two compounds are remarkably similar. Time-resolved NIR emission of 1 O 2 , gas chromatography and NMR spectroscopy, reveal that the difference in observed photostability is due to the greater quantum yield for 1 O 2 generation of the photodegradation products in the case of NSTP .",
  "abstract_shown": true,
  "affiliations": [
    "Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 3, Groningen, Groningen, Netherlands, 9747AG",
    "Institute of Molecules and Materials, FELIX, Nijmegen University, Toernooiveld 7c, Nijmegen, Netherlands, 6525ED",
    "Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, Amsterdam, Netherlands, 1098XH",
    "Institut Universitaire de France",
    "CNRS, Nantes Université, CEISAM UMR 6230, Nantes, France, F-44000"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Andy S. Sardjan",
      "orcid": "0000-0002-7084-6285"
    },
    {
      "affs": [
        0
      ],
      "name": "Ruben Feringa",
      "orcid": "0000-0001-9925-5772"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Wybren Jan Buma",
      "orcid": "0000-0002-1265-8016"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Denis Jacquemin",
      "orcid": "0000-0002-4217-0708"
    },
    {
      "affs": [
        0
      ],
      "name": "Wesley R. Browne",
      "orcid": "0000-0001-5063-6961"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3zw4dgrh94hg8.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009674/v1",
  "fulltext_url": null,
  "id": "3zw4dgrh94hg8",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009674/v1",
  "language": null,
  "licence": "CC-BY-NC",
  "licence_label": "CC BY-NC",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|Photochromic and Fluorescence Chemistry"
    ]
  ],
  "openalex": "W7214928202",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009674/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/3zw4dgrh94hg8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "10.26434/chemrxiv.15009674",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009674/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Photochromic and Fluorescence Chemistry",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Product Accelerated Photodegradation of Nitro-Spirothiopyrans",
  "title_text": "Product Accelerated Photodegradation of Nitro-Spirothiopyrans",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/3zw4dgrh94hg8",
  "venue": "ChemRxiv",
  "versions": []
}