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However, owing to their nearly identical kinetic diameters and closely related physicochemical properties (e.g., solubility parameters and boiling points), membrane\u2010based liquid\u2010phase separation of such linear and branched alkanes remains highly challenging. An example is the\n                    <jats:italic>n\u2010<\/jats:italic>\n                    heptane\/\n                    <jats:italic>iso<\/jats:italic>\n                    \u2010octane pair, which exhibits minimal differences in molecular size and physicochemical properties but a dramatic difference in RON. Herein, we report a conjugated\u2010polymer\u2010framework (CPF) membrane that enables molecular\u2010level separation of linear and branched alkanes. The crystallized selective layer of CPF membrane features intrinsic sub\u2010nanometer pores of \u223c5.5 and 8.4 \u00c5. With ethanol as an assisting agent, the membrane achieves a separation factor of 5.24 for\n                    <jats:italic>n<\/jats:italic>\n                    \u2010heptane\/\n                    <jats:italic>iso<\/jats:italic>\n                    \u2010octane mixture, together with a total mixture permeance of 0.020\u00a0kg m\n                    <jats:sup>\u22122<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    bar\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This pronounced selectivity stems from ethanol\u2010induced modulation of transmembrane transport, which selectively mitigates the transport barrier of linear alkanes while exerting negligible influence on their branched counterparts, thereby enhancing kinetic selectivity. Furthermore, the CPF membrane exhibits robust separation performance over extended operation and across a wide range of feed compositions and pressures, highlighting its robustness for linear\/branched alkane separation.\n                  <\/jats:p>","DOI":"10.1002\/anie.9101966","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T08:54:14Z","timestamp":1791968054000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Linear and Branched Alkanes Separation Through Conjugated\u2010Polymer\u2010Framework Membranes"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6176-8238","authenticated-orcid":false,"given":"Muhammad Qaisar","family":"Sultan","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center For Nanoscience and Technology  Beijing P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6581-7904","authenticated-orcid":false,"given":"Yuyang","family":"Qian","sequence":"additional","affiliation":[{"name":"CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center For Nanoscience and Technology  Beijing P. R. China"},{"name":"University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1002-3295","authenticated-orcid":false,"given":"Yunyang","family":"Wang","sequence":"additional","affiliation":[{"name":"CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center For Nanoscience and Technology  Beijing P. R. China"},{"name":"University of Chinese Academy of Sciences  Beijing P. R. 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