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Here, we report a low\u2010cost manganese\u2010based metal\u2010organic framework (MOF), Mn\u2010dcbp, featuring an adaptive \u201ccorner\u2010pocket\u201d channel structure. While retaining C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    \/C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    sieving selectivity, the material successfully integrates a high acetylene (C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    ) uptake (126.3 cm\n                    <jats:sup>3<\/jats:sup>\n                    \/cm\n                    <jats:sup>3<\/jats:sup>\n                    ) with ultrafast diffusion kinetics (k\u00a0=\u00a00.01863 s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). In situ single\u2010crystal x\u2010ray diffraction reveals a sub\u2010angstrom\u2010level structural adaptation mechanism induced by C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    , leading to ordered, high\u2010density packing of C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    within the channels and achieving a record storage density of 1.02\u00a0g\/mL. Strong host\u2013guest interactions enable the material to maintain excellent C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    adsorption capacity (110.6 cm\n                    <jats:sup>3<\/jats:sup>\n                    \/cm\n                    <jats:sup>3<\/jats:sup>\n                    ) even at elevated temperatures (75\u00a0\u00b0C), while also demonstrating superior separation performance for C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    \/C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    and C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    gas mixtures. Furthermore, Mn\u2010dcbp can be produced on a large scale via an environmentally friendly route and exhibits excellent, water, thermal, and cycling stability, which is crucial for potential industrial implementation.\n                  <\/jats:p>","DOI":"10.1002\/anie.8460951","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T05:44:01Z","timestamp":1774503841000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Adaptive Corner\u2010Pocket Channels in a Metal\u2010Organic Framework for Acetylene Ultra\u2010Fast Diffusion and Storage"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-8435-0343","authenticated-orcid":false,"given":"Yuejiang","family":"Han","sequence":"first","affiliation":[{"name":"College of Chemistry Liaoning University  Shenyang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5944-3450","authenticated-orcid":false,"given":"Chunqing","family":"Ji","sequence":"additional","affiliation":[{"name":"State Key Lab of Structure Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingyao","family":"He","sequence":"additional","affiliation":[{"name":"College of Chemistry Liaoning University  Shenyang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4917-3142","authenticated-orcid":false,"given":"Yuning","family":"Lou","sequence":"additional","affiliation":[{"name":"College of Chemistry Liaoning University  Shenyang P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8635-9783","authenticated-orcid":false,"given":"Zhengbo","family":"Han","sequence":"additional","affiliation":[{"name":"College of Chemistry Liaoning University  Shenyang P. R. 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