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Here, we show a supramolecular host\u2013guest strategy to harvest the energy from the low\u2010lying triplet state of C\n                    <jats:sub>64<\/jats:sub>\n                    nanographene tetraimide\n                    <jats:bold>1<\/jats:bold>\n                    .\n                    <jats:sup>1<\/jats:sup>\n                    H\u2005NMR and X\u2010ray analysis confirmed the 1\u2009:\u20092 stoichiometric binding of a Pt(II) porphyrin on the two \u03c0\u2010surfaces of\n                    <jats:bold>1<\/jats:bold>\n                    . While the free\n                    <jats:bold>1<\/jats:bold>\n                    does not show emission in the NIR, the host\u2013guest complex solution shows NIR phosphorescence at 77\u2005K. Further, between 860\u20131100\u2005nm, room temperature NIR phosphorescence (\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    =900\u2005nm,\n                    <jats:italic>\u03c4<\/jats:italic>\n                    <jats:sub>avg<\/jats:sub>\n                    =142\u2005\u03bcs) was observed for a solid\u2010state sample drop\u2010casted from a preformed complex in solution. Theoretical calculations reveal a non\u2010zero spin\u2013orbit coupling between isoenergetic S\n                    <jats:sub>1<\/jats:sub>\n                    and T\n                    <jats:sub>3<\/jats:sub>\n                    of \u03c0\u2010stacked [\n                    <jats:bold>1<\/jats:bold>\n                    \u2009\u22c5\u2009Pt(II) porphyrin] complex. External heavy\u2010atom\u2010induced spin\u2013orbit coupling along with rigidification and protection from oxygen in the solid\u2010state promotes both the intersystem crossing from the first excited singlet state into the triplet manifold and the NIR phosphorescence from the lowest triplet state of\n                    <jats:bold>1<\/jats:bold>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/anie.202406353","type":"journal-article","created":{"date-parts":[[2024,5,7]],"date-time":"2024-05-07T11:53:13Z","timestamp":1715082793000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Room\u2010Temperature Near\u2010Infrared Phosphorescence from C\n                    <sub>64<\/sub>\n                    Nanographene Tetraimide by \u03c0\u2010Stacking Complexation with Platinum Porphyrin"],"prefix":"10.1002","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1882-5273","authenticated-orcid":false,"given":"M. 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