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In this work, the first example of a mixed\u2010valence radical cation dimer based on an odd alternant hydrocarbon, [OR5]\n                    <jats:sub>2<\/jats:sub>\n                    <jats:sup>+\u2022<\/jats:sup>\n                    [FeCl\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sup>\u2212<\/jats:sup>\n                    (OR5\u2010MV), was successfully prepared by the oxidation of olympicenyl radical (OR) derivative OR5 using FeCl\n                    <jats:sub>3<\/jats:sub>\n                    . X\u2010ray crystallographic analysis revealed that cation\u2010radical dimer [OR5]\n                    <jats:sub>2<\/jats:sub>\n                    <jats:sup>+\u2022<\/jats:sup>\n                    , acting as a fundamental building block, forms [OR5]\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2+<\/jats:sup>\n                    tetramer via a multi\u2010center\u2013two\u2010electron bond, which further aggregates into a one\u2010dimensional chain in the solid state. SQUID measurement reveals that the magnetic susceptibility is dominated by the FeCl\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>\u2013<\/jats:sup>\n                    anions with no detectable OR5 moiety contribution. Theoretical calculations disclosed an open\u2010shell singlet ground state for [OR5]\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2+<\/jats:sup>\n                    tetramer and demonstrated that the pancake\u2010bond formation between OR5 cation\u2010radical dimers confers significant energetic stabilization. Compared to the neutral compound, more uniform molecular packing and reduced intermolecular distance in the one\u2010dimensional columnar architecture of OR5\u2010MV facilitate effective intermolecular orbital overlap, leading to broader band dispersion along the molecular stacking direction. A substantially improved electrical conductivity of up to 10\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    S cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    is achieved compared to neutral radical (10\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>9<\/jats:sup>\n                    S cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    ), representing the highest value reported for monomeric odd alternant hydrocarbons.\n                  <\/jats:p>","DOI":"10.1002\/anie.2581535","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T06:10:17Z","timestamp":1791871817000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mixed\u2010Valence Dimeric Olympicenyl Radical Cation With Improved Electrical Conductivity"],"prefix":"10.1002","author":[{"given":"Qin","family":"Xiang","sequence":"first","affiliation":[{"name":"College of Chemical Engineering and Materials Shandong University of Aeronautics  Binzhou P. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1999-5127","authenticated-orcid":false,"given":"Shuaishuai","family":"Ding","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuit Department of Chemistry Institute of Molecular Aggregation Science Ministry of Education &amp; Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6194-4054","authenticated-orcid":false,"given":"Zhe","family":"Sun","sequence":"additional","affiliation":[{"name":"Institute of Molecular Plus Department of Chemistry Tianjin University and Haihe Laboratory of Sustainable Chemical Transformations  Tianjin P. R. China"},{"name":"State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai  P. R. 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