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Benzoyl fusion at the\n                    <jats:italic>pseudo\u2010peri<\/jats:italic>\n                    positions, achieved through intramolecular Friedel\u2013Crafts planarization, creates the first benzoyl\u2010functionalized PXX monomers, dimers, and trimers that exhibit deep red\u2013NIR absorption and emission without significantly raising the HOMO level. The ribbons display strong, tunable absorption and fluorescence bands, with up to 63% of emission in the NIR and an NIR fluorescence quantum yield\u00a0reaching 0.36 in solution. Lewis adducts formed between boron\u2010based Lewis acids and carbonyl acceptor sites further enhance the electron\u2010accepting nature of the ketones, producing pure NIR emission ( \u2248 0.15\u20130.16). Spectroelectrochemical investigations uncover reversible electrochromism and electrofluorochromism, allowing\u00a0redox\u2010gated switching and NIR absorption signatures, useful for sensing and display technologies. When embedded in a nematic liquid crystal phase, the ribbons function as cascaded F\u00f6rster resonance energy transfer (FRET) antennas, achieving near\u2010quantitative single\u2010step energy transfer (\n                    <jats:sub>FRET<\/jats:sub>\n                    \u00a0=\u00a00.97) and highly efficient two\u2010step transfer (\n                    <jats:sub>FRET<\/jats:sub>\n                    \u00a0=\u00a00.70), enabling directional energy funneling. Their complementary absorption broadens the excitation window to cover the entire visible spectrum, making them highly efficient panchromatic light\u2010harvesting materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.202523349","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T09:41:57Z","timestamp":1767951717000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Benzoyl\u2010Xanthenoxanthenes: Versatile Chromophores for Light\u2010Engaging Applications"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0376-5829","authenticated-orcid":false,"given":"Cristian","family":"De Luca","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry, Faculty of Chemistry University of Vienna  Vienna 1090 Austria"},{"name":"Vienna Doctoral School in Chemistry University of Vienna  W\u00e4hringer Stra\u00dfe 42 Vienna 1090 Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3263-5908","authenticated-orcid":false,"given":"El Czar","family":"Galleposo","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry, Faculty of Chemistry University of Vienna  Vienna 1090 Austria"},{"name":"Vienna Doctoral School in Chemistry University of Vienna  W\u00e4hringer Stra\u00dfe 42 Vienna 1090 Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8410-6245","authenticated-orcid":false,"given":"R\u00faben R.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry, Faculty of Chemistry University of Vienna  Vienna 1090 Austria"},{"name":"Vienna Doctoral School in Chemistry University of Vienna  W\u00e4hringer Stra\u00dfe 42 Vienna 1090 Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5244-4980","authenticated-orcid":false,"given":"Chiara","family":"Puccinelli","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry, Faculty of Chemistry University of Vienna  Vienna 1090 Austria"},{"name":"Vienna Doctoral School in Chemistry University of Vienna  W\u00e4hringer Stra\u00dfe 42 Vienna 1090 Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2113-9920","authenticated-orcid":false,"given":"Herwig","family":"Peterlik","sequence":"additional","affiliation":[{"name":"Faculty Center for Nano Structure Research Faculty of Physics University of Vienna  Wien 1090 Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2911-1586","authenticated-orcid":false,"given":"Pradip Kumar","family":"Mondal","sequence":"additional","affiliation":[{"name":"Elettra Sincrotrone Trieste S.C.p.A.  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