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Here, we introduce a topological confinement strategy that generates a previously inaccessible class of open\u2011shell species: neutral soliton\u2011type radicals, within amidine\u2011linked oligoacetylene networks. In chemical terms, these species are characterized by a delocalized spin density over the conjugated backbone, distinguishing them from conventional localized radicals. These materials exhibit a distinct axial\n                    <jats:italic>g<\/jats:italic>\n                    \u2011tensor, Curie behavior, and broad near\u2011infrared absorption extending to 1000\u00a0nm. Unlike conventional photothermal systems, where heat originates from exciton transfer energy to the lattice via nonradiative processes, our system stores light energy in long\u2010lived soliton states that dissipate via lattice vibrations, producing no ground\u2011state bleach yet enabling efficient heat generation. Using this mechanism, the materials drive aldehyde\u2011indole coupling under mild light irradiation through a photothermal catalytic pathway. More broadly, this work translates soliton physics into a synthetic materials platform for spin\u2011functional materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.1829584","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T03:58:46Z","timestamp":1791950326000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Generation and Stabilization of Soliton\u2010Type Radicals in Amidine\u2010Linked Porous Oligoacetylene Polymers by Topological Confinement Strategy for Photothermal Catalysis"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-1191-0144","authenticated-orcid":false,"given":"Jiahui","family":"Yu","sequence":"first","affiliation":[{"name":"College of Polymer Science and Engineering, State Key Laboratory of Advanced Polymer Materials Sichuan University  Chengdu P. R. 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