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However, constructing biomimetic ion\u2010sieving membranes with precise recognition capabilities for target ions remains challenging. Herein, we propose a rotaxane\u2010induced stacking method for constructing COF membranes integrated with ion\u2010recognition sub\u2010nanoscale channels. The dibenzo\u2010crown ether rotaxane COF (CRCOF) nanosheets are fabricated and subsequently stacked into membranes. Driven by \u03c0\u2013\u03c0 interactions between rotaxane moieties and CRCOF nanosheets, as well as the specific ion\u2010recognition ability of rotaxanes, the nanosheets undergo oriented stacking, yielding well\u2010defined sub\u2010nanoscale channels equipped with recognition sites. The angstrom\u2010scale pore size and specific binding channels synergistically enhance selectivity and minimize transport energy penalties of target ions. By modulating the ion recognition capability of channels, the obtained CRCOF membrane demonstrates an exceptional Li\n                    <jats:sup>+<\/jats:sup>\n                    permeation rate of 0.04\u00a0mol m\n                    <jats:sup>\u22122<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    (approximately five times higher than reported polymer membranes) and high Li\n                    <jats:sup>+<\/jats:sup>\n                    selectivity (Li\n                    <jats:sup>+<\/jats:sup>\n                    \/Mg\n                    <jats:sup>2+<\/jats:sup>\n                    selectivity of 315 and Li\n                    <jats:sup>+<\/jats:sup>\n                    \/Na\n                    <jats:sup>+<\/jats:sup>\n                    selectivity of 12) in a mixture solution. This work provides a new avenue for the accurate construction of biomimetic ion\u2010sieving membranes and offers new insights into the mechanisms of high\u2010efficiency ion separation in sub\u2010nanoscale confined recognition channels.\n                  <\/jats:p>","DOI":"10.1002\/anie.202525413","type":"journal-article","created":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T07:22:33Z","timestamp":1770016953000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Crown Ether Rotaxane\u2010Induced Construction of COF Membranes With Recognition Channels for High\u2010Efficiency Ion Sieving"],"prefix":"10.1002","volume":"65","author":[{"given":"Liang","family":"Ren","sequence":"first","affiliation":[{"name":"State Key Laboratory of Bio\u2010based Fiber Materials Key Laboratory of Marine Resource Chemistry and Food Technology in Ministry of Education Tianjin University of Science and Technology  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinrui","family":"Song","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Bio\u2010based Fiber Materials Key Laboratory of Marine Resource Chemistry and Food Technology in Ministry of Education Tianjin University of Science and Technology  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nan","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Bio\u2010based Fiber Materials Key Laboratory of Marine Resource Chemistry and Food Technology in Ministry of Education Tianjin University of Science and Technology  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yafei","family":"Guo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Bio\u2010based Fiber Materials Key Laboratory of Marine Resource Chemistry and Food Technology in Ministry of Education Tianjin University of Science and Technology  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nelson","family":"Belzile","sequence":"additional","affiliation":[{"name":"School of Natural Sciences Laurentian University  Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1728-2943","authenticated-orcid":false,"given":"Tianlong","family":"Deng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Bio\u2010based Fiber Materials Key Laboratory of Marine Resource Chemistry and Food Technology in Ministry of Education Tianjin University of Science and Technology  Tianjin P. R. 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