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true 3.1 HZDR.RODARE 10.14278/rodare.3741 Raza, Asif a Department of Chemical Sciences, Bernal Institute and Research Ireland Centre for Pharmaceuticals (SSPC), University of Limerick, Limerick V94 T9PX, Ireland Javan Nikkhah, Sousa a Department of Chemical Sciences, Bernal Institute and Research Ireland Centre for Pharmaceuticals (SSPC), University of Limerick, Limerick V94 T9PX, Ireland Croitor, Lilia a Department of Chemical Sciences, Bernal Institute and Research Ireland Centre for Pharmaceuticals (SSPC), University of Limerick, Limerick V94 T9PX, Ireland Elsherif, Ahmed Gamal Attallah 0000-0002-7759-0315 Hirschmann, Eric 0000-0001-5782-9627 Vandiche, Matthias a Department of Chemical Sciences, Bernal Institute and Research Ireland Centre for Pharmaceuticals (SSPC), University of Limerick, Limerick V94 T9PX, Ireland Mukherjee, Soumya a Department of Chemical Sciences, Bernal Institute and Research Ireland Centre for Pharmaceuticals (SSPC), University of Limerick, Limerick V94 T9PX, Ireland Rodare 2025 2025-05-12 https://rodare.hzdr.de/record/3741 https://www.hzdr.de/publications/Publ-41324 https://www.hzdr.de/publications/Publ-41322 10.14278/rodare.3740 https://rodare.hzdr.de/communities/rodare Creative Commons Attribution 4.0 International Open Access <p>A nanopore engineering approach enhances acetylene (C2H2) over carbon dioxide (CO2) selectivity in ionic ultramicroporous polymers (IUPs), an understudied class of sorbents. Extending the cationic arm of a prototypical IUP nearly doubles its C2H2/CO2 selectivity from 4.9 to 8.5 (at 298 K, 1 bar), underpinned by further observations from dynamic separation experiments and bespoke computational insights.</p>