{
  "abstract": "A curved five-porphyrin circulene has been synthesized through oxidative fusion of a cyclic precursor, prepared by Yamamoto coupling. The saddle-shaped geometry of this molecule was confirmed by single-crystal X-ray diffraction. In solution, it undergoes a rapid saddle-to-saddle inversion, even at 200 K, resulting in a simple 1 H NMR spectrum. Despite its pronounced negative curvature (Gauss curvature: –0.30 Å –2 ), it exhibits efficient electronic delocalization, with an electrochemical band gap of 0.88 eV and near-infrared absorption (λ max 1200 nm). It has a high affinity for C 60 and C 70 , in toluene at 298 K. There is no significant bond length alternation around the central 10-membered ring, and computational studies reveal a substantial diatropic current around this ring, establishing the porphyrin circulene as a globally aromatic curved nanographene.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry",
    "University of Oxford"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Sara Borghi"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Raymond M. van Rijn"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Ka Man Cheung"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Lene A. Gödde"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Harold W. Mackenzie"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Harry L. Anderson",
      "orcid": "0000-0002-1801-8132"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/58e7kgacsmfmn.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15011177/v1",
  "fulltext_url": null,
  "id": "58e7kgacsmfmn",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011177/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",
      "1605|Synthesis and Properties of Aromatic Compounds"
    ]
  ],
  "openalex": "W7224128130",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/58e7kgacsmfmn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:26Z",
      "native_id": "10.26434/chemrxiv.15011177",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15011177/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:1605|Synthesis and Properties of Aromatic Compounds",
      "subfield": "organic"
    }
  ],
  "title": "A Negatively Curved Porphyrin [10]Circulene",
  "title_text": "A Negatively Curved Porphyrin [10]Circulene",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:26Z",
  "url": "https://research.draconitic.com/paper/58e7kgacsmfmn",
  "venue": "ChemRxiv",
  "versions": []
}