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X\u2010ray analysis and DFT calculations revealed that the aromatic frameworks are slightly twisted or curved around the internal region. Internal fusion results in significant red\u2010shifts in the UV\u2010vis and fluorescence spectra and ready electrochemical reduction, due to the lowered LUMO level relative to that of the parent compound. NICS and ACID analyses were used to evaluate the aromaticity of these compounds, indicating that the five\u2010membered rings are nearly nonaromatic in all compounds.\n                  <\/jats:p>","DOI":"10.1002\/chem.71767","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T08:27:34Z","timestamp":1791275254000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Synthesis, Structures, and Properties of Cyclopenta\u2010Fused Anthra[1,2\u2010\n                    <i>a<\/i>\n                    ]anthracene Derivatives as New Polycyclic Aromatic Compounds"],"prefix":"10.1002","author":[{"given":"Moe","family":"Kobayashi","sequence":"first","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-6708-9348","authenticated-orcid":false,"given":"Yu","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eiji","family":"Tsurumaki","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0887-2458","authenticated-orcid":false,"given":"Masahiro","family":"Yamashina","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8371-6562","authenticated-orcid":false,"given":"Hiroshi","family":"Ikeda","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"},{"name":"Tokyo Metropolitan College of Industrial Technology  Shinagawa\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5434-2590","authenticated-orcid":false,"given":"Daiki","family":"Tauchi","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Kitasato University  Sagamihara Kanagawa Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3302-6496","authenticated-orcid":false,"given":"Masashi","family":"Hasegawa","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Kitasato University  Sagamihara Kanagawa Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1504-2030","authenticated-orcid":false,"given":"Shinji","family":"Toyota","sequence":"additional","affiliation":[{"name":"Department of Chemistry, School of Science Institute of Science Tokyo  Meguro\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"e_1_2_8_2_1","first-page":"586","volume-title":"Polycyclic Aromatic Hydrocarbons","author":"Harvey R. 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