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However, C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    produced via the calcium carbide process contains trace CO\n                    <jats:sub>2<\/jats:sub>\n                    impurities, necessitating purification. Due to their comparable molecular dimensions (3.3 \u00d7 3.3 \u00d7 5.7 \u00c5\n                    <jats:sup>3<\/jats:sup>\n                    for C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    vs 3.2 \u00d7 3.3 \u00d7 5.4 \u00c5\n                    <jats:sup>3<\/jats:sup>\n                    for CO\n                    <jats:sub>2<\/jats:sub>\n                    ), achieving effective separation remains a challenge. For the first time, this work achieves efficient C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    separation in an ultra\u2010stable metal\u2013organic framework (MOF) featuring a synergistic rigid\u2010flexible structure, characterized by a 2\u2010fold interpenetrating MOF that incorporates an unprecedented [Zn\n                    <jats:sub>4<\/jats:sub>\n                    N\n                    <jats:sub>9<\/jats:sub>\n                    ]\n                    <jats:sub>n<\/jats:sub>\n                    chain. The rigid molecular chains ensure stability, as the structure is retained after immersion in strong acidic environments for one month. The 2\u2010fold interpenetration architecture imparts controlled structural flexibility to the framework, triggering a stimuli\u2010responsive gate\u2010opening phenomenon upon C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    adsorption. This dynamic structural transformation induces a significant pore environment modulation, as quantified by the expansion of the pore limiting diameter (\n                    <jats:italic>PLD<\/jats:italic>\n                    ) from 3.09 to 3.34 \u00c5. The precisely tuned aperture demonstrates exceptional molecular sieving capabilities, permitting selective C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    permeation while effectively rejecting CO\n                    <jats:sub>2<\/jats:sub>\n                    molecules due to their differential kinetic diameters. Integrated analysis of gas adsorption isotherms, theoretical calculations, breakthrough experiments, and stability assessments synergistically confirm the structural robustness and selective separation efficacy of this interpenetrated framework.\n                  <\/jats:p>","DOI":"10.1002\/adma.202514488","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T05:22:08Z","timestamp":1759468928000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Acetylene\u2010Triggered Gate\u2010Opening Behavior in a Stable Rigid\u2010Flexible MOF for Efficient C\n                    <sub>2<\/sub>\n                    H\n                    <sub>2<\/sub>\n                    \/CO\n                    <sub>2<\/sub>\n                    Separation"],"prefix":"10.1002","volume":"38","author":[{"given":"Chunyu","family":"Lu","sequence":"first","affiliation":[{"name":"Shandong Key Laboratory of Intelligent Energy Materials School of Materials Science and Engineering China State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China)  Qingdao Shandong 266580 P. 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