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Flexible covalent organic frameworks (COFs) are promising candidates due to their structural adaptability, yet how their structural reconfigurations govern iodine adsorption remains unknown. Herein, we report the design and synthesis of two highly crystalline, ether\u2010embedded flexible COFs (F\u2010TEA and F\u2010BEA), along with a rigid, ether\u2010free counterpart (R\u2010TPA) as a control. In the triazine\u2010containing F\u2010TEA, the ether bond reduces steric hindrance between triazine and benzene rings, which improves adsorption\u2010site accessibility and enhances halogen\u2010bond interactions, thereby leading to superior iodine vapor capture (F\u2010TEA&gt;F\u2010BEA&gt;R\u2010TPA). However, the triazine ring also induces an ether\u2010bond locking effect, triggering a water\u2010responsive structural rearrangement that reduces micropore accessibility and water\u2010phase adsorption. In contrast, the triazine\u2010free F\u2010BEA possesses freely rotating ether bonds that enable adaptive framework swelling, which can accommodate more iodine molecules and facilitate iodine uptake through multi\u2010site charge transfer. Consequently, F\u2010BEA achieves a high iodine adsorption capacity of 7.25\u00a0g g\n                    <jats:sup>\u22121<\/jats:sup>\n                    from aqueous solution, whereas the rigid R\u2010TPA undergoes framework collapse and exhibits the lowest performance. This study establishes conformational control of flexible linkages as a key design principle for high\u2010performance porous iodine adsorbents.\n                  <\/jats:p>","DOI":"10.1002\/smll.73655","type":"journal-article","created":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T10:45:42Z","timestamp":1777977942000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Adaptive Structural Reconfiguration in Ether\u2010Incorporated Covalent Organic Frameworks Enables Efficient Iodine Capture"],"prefix":"10.1002","volume":"22","author":[{"given":"Yuxin","family":"Liang","sequence":"first","affiliation":[{"name":"School of Marine Sciences (State Key Laboratory of Marine Resources Utilization in South China Sea) Hainan University  Haikou P. R. 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