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Even a slight deviation from the planar structure can lead to intriguing (chiro)optical features for helically twisted nanographenes. In this context, we introduce two regioisomeric \u03c0\u2010extended nanographenes that exhibit distinct excited\u2010state characteristics. The helicene structure and the photophysical features can be easily tuned by changing the connecting position of the nanographene to the carbazole core (2,7\u2212 and 3,6\u2212). Single\u2010crystal X\u2010ray diffraction analysis confirmed the formation of nanographenes with bent and helical conformations. Both derivatives exhibited thermally activated delayed fluorescence at room temperature and phosphorescence at low temperatures. Notably, the nanographene with the bent structure displayed an impressive red afterglow lasting over 30\u2005seconds, in contrast to the very weak afterglow observed in the helical structure. DFT calculations revealed the existence of an isoenergetic higher triplet state (T\n                    <jats:sub>8<\/jats:sub>\n                    ) and comparatively weak spin\u2010orbit coupling (T\n                    <jats:sub>1<\/jats:sub>\n                    \u2010S\n                    <jats:sub>0<\/jats:sub>\n                    ), thereby enabling the bent nanographene to exhibit a long\u2010lived component and strong afterglow. Our findings highlight the significance of regioisomeric nanographenes with exceptional optical properties and offer a deeper understanding of the structure\u2013property relationship in nonplanar nanographenes.\n                  <\/jats:p>","DOI":"10.1002\/anie.202422125","type":"journal-article","created":{"date-parts":[[2025,1,8]],"date-time":"2025-01-08T07:30:45Z","timestamp":1736321445000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Regioisomeric \u03c0\u2010Extended Nanographene with Long\u2010Lived Phosphorescence Afterglow"],"prefix":"10.1002","volume":"64","author":[{"given":"Viksit","family":"Kumar","sequence":"first","affiliation":[{"name":"Organic Chemistry Division National Chemical Laboratory (CSIR-NCL)  Dr. Homi Bhabha Road Pune 411008 India"},{"name":"Academy of Scientific and Innovative Research (AcSIR)  Ghaziabad 201 002 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