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By selectively exciting different regions of the Q bands, we uncover strongly excitation-dependent relaxation dynamics in the aggregates. Photoexcitation centered on the lower-energy Q transition leads to pronounced interband coupling and clear signatures of exciton\u2013exciton annihilation, whereas selective excitation of the higher-energy side of the Q-band manifold limits annihilation. These findings provide new insight into how the mixed Q-band structure governs excitation flow in porphyrin aggregates and open avenues for the rational design of materials with tailored annihilation properties.<\/jats:p>","DOI":"10.1021\/acsphyschemau.6c00064","type":"journal-article","created":{"date-parts":[[2026,7,4]],"date-time":"2026-07-04T16:54:12Z","timestamp":1783184052000},"page":"1192-1202","source":"Crossref","is-referenced-by-count":0,"title":["Selective\nQ-Band Excitation Modulates Exciton\u2013Exciton\nAnnihilation in Tetra(\n                    <i>p<\/i>\n                    -Sulfonatophenyl)porphyrin\nJ-Aggregates"],"prefix":"10.1021","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2691-2764","authenticated-orcid":true,"given":"Maria Francesca","family":"Cherchi","sequence":"first","affiliation":[{"name":"University of Padova , , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5970-8949","authenticated-orcid":true,"given":"Teresa","family":"Paviglianiti","sequence":"additional","affiliation":[{"name":"University of Padova , , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dario","family":"Baldon","sequence":"additional","affiliation":[{"name":"University of Padova , , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7733-4593","authenticated-orcid":true,"given":"Federico","family":"Toffoletti","sequence":"additional","affiliation":[{"name":"University of Padova , , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1019-9100","authenticated-orcid":true,"given":"Elisabetta","family":"Collini","sequence":"additional","affiliation":[{"name":"University of Padova , , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,4]]},"reference":[{"key":"2026092310080112700_cit1","doi-asserted-by":"crossref","DOI":"10.1142\/3609","volume-title":"Photosynthetic Excitons","author":"Amerongen","year":"2000"},{"issue":"12","key":"2026092310080112700_cit2","doi-asserted-by":"publisher","first-page":"1922","DOI":"10.1021\/ar9001697","article-title":"Discrete Cyclic Porphyrin Arrays as Artificial Light-Harvesting\nAntenna","volume":"42","author":"Aratani","year":"2009","journal-title":"Acc. 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