{
  "abstract": "Stimuli-responsive metal–organic frameworks (MOFs) offer opportunities to couple structural transformations with switchable electronic states, yet reproducing spin-crossover (SCO) behaviour across different frameworks and metal centres remains challenging. Here, we demonstrate a conserved watergated switching mechanism in a family of flexible tetrazolate MOFs comprising Fe(II), Co(II), and mixed Fe/Co frameworks. Dehydration induces framework contraction, metal–N bond shortening, ligand immobilization, and a shift toward low-spin states, while rehydration restores the initial structure and physical properties. Remarkably, despite their markedly different initial spin-state populations, upon dehydration of Fe- and Co-based frameworks, Raman spectroscopy reveals an identical 13 cm-1 shift of a tetrazolate/phenyl-ring vibration, identified as a spin state marker band. This molecular fingerprint is also retained in the mixed-metal solid solution, demonstrating that the structural and vibrational response is conserved upon metal substitution and mixing. These results identify water desorption as the thermodynamic trigger, and the flexible tetrazolate network as the mediator that couples guest removal to metal-centre spin transition, providing a transferable strategy for water-gated spin switching in flexible tetrazolate frameworks.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 12,
  "authors": [
    {
      "name": "Sara Gullace"
    },
    {
      "name": "Ana Martinez-Martinez"
    },
    {
      "name": "César Fabro"
    },
    {
      "name": "Mar García Hernández"
    },
    {
      "name": "Oscar Fabelo"
    },
    {
      "name": "Fanny Richard"
    },
    {
      "name": "Paolo Samorì"
    },
    {
      "name": "Jorge Albalad"
    },
    {
      "name": "Daniel Maspoch"
    },
    {
      "name": "E. Carolina Sañudo"
    },
    {
      "name": "José Sánchez Costa"
    },
    {
      "name": "Jose Sanchez Costa",
      "orcid": "0000-0001-5426-7956"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/agb6k2fg9b8ca.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009018/v1",
  "fulltext_url": null,
  "id": "agb6k2fg9b8ca",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009018/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1604|Metal-Organic Frameworks: Synthesis and Applications"
    ]
  ],
  "openalex": "W7213551381",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009018/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/agb6k2fg9b8ca.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:19Z",
      "native_id": "10.26434/chemrxiv.15009018",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009018/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1604|Metal-Organic Frameworks: Synthesis and Applications",
      "subfield": "inorganic"
    }
  ],
  "title": "Water-Gated Molecular Bistability in Tetrazolate MOFs",
  "title_text": "Water-Gated Molecular Bistability in Tetrazolate MOFs",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:19Z",
  "url": "https://research.draconitic.com/paper/agb6k2fg9b8ca",
  "venue": "ChemRxiv",
  "versions": []
}