{
  "abstract": "Conductive metal-organic frameworks (MOFs) based on low-valent heavy transition metals remain largely unexplored despite the strong metal-ligand covalency and extended orbitals that should favor electronic delocalization. Herein, we report Nb(pyz) 2 Cl 2 (pyz = pyrazine), a layered coordination framework with a metallic electronic ground state. Although charge transport in pressed pellets is limited by thermally activated grain-boundary hopping, the high room-temperature conductivity of 1.2 S cm⁻ 1 , temperature-independent Pauli susceptibility, finite Sommerfeld coefficient (g = 14.0(5) mJ K⁻ 2 mol⁻ 1 ), Wilson ratio close to unity, and periodic density functional theory calculations consistently demonstrate a finite density of states at the Fermi level. X-ray absorption spectroscopy further reveals a strongly delocalized electronic structure involving mixed Nb 4d, Cl 3p, and pyz p* states. These results identify low-valent early-4d ions as promising components for electronically delocalized coordination solids and extend metallic metal-organic frameworks beyond the 3d transition-metal series.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "name": "Michał Magott",
      "orcid": "0000-0002-4566-2636"
    },
    {
      "name": "Dominik Dzierżek",
      "orcid": "0009-0004-9357-9193"
    },
    {
      "name": "Katia Dujarric"
    },
    {
      "name": "Pierre Dechambenoit",
      "orcid": "0000-0001-7850-2260"
    },
    {
      "name": "Mathieu Rouzières",
      "orcid": "0000-0003-3457-3133"
    },
    {
      "name": "Gabriela Handzlik",
      "orcid": "0000-0002-7325-0700"
    },
    {
      "name": "Leszek M. Malec",
      "orcid": "0000-0003-0540-375X"
    },
    {
      "name": "Elizaveta A. Suturina",
      "orcid": "0000-0003-4407-1882"
    },
    {
      "name": "Andrei Rogalev",
      "orcid": "0000-0002-0501-698X"
    },
    {
      "name": "Corine Mathonière",
      "orcid": "0000-0002-4774-1610"
    },
    {
      "name": "Rodolphe Clérac",
      "orcid": "0000-0001-5429-7418"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d7tvw255m2am6.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15005165/v2",
  "fulltext_url": null,
  "id": "d7tvw255m2am6",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15005165/v2",
  "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": "W7212053473",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15005165/v2",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/d7tvw255m2am6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:19Z",
      "native_id": "10.26434/chemrxiv.15005165",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15005165/v2"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1604|Metal-Organic Frameworks: Synthesis and Applications",
      "subfield": "inorganic"
    }
  ],
  "title": "A Metallic Ground State in a Niobium-Pyrazine Coordination Framework",
  "title_text": "A Metallic Ground State in a Niobium-Pyrazine Coordination Framework",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:19Z",
  "url": "https://research.draconitic.com/paper/d7tvw255m2am6",
  "venue": "ChemRxiv",
  "versions": []
}