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One of the biggest challenges facing isoreticular chemistry is to extend it to ligands with strongly coordinating substituent groups such as unbound \u2212COOH, because competitive interactions between such groups and metal ions can derail isoreticular chemistry. It is even more challenging to have an isoreticular series of carboxyl\u2010functionalized MOFs capable of encompassing chemically disparate metal ions. Here, with the simultaneous introduction of carboxyl functionalization and pore space partition, a family of carboxyl\u2010functionalized materials is developed in diverse compositions from homometallic Cr\n                    <jats:sup>3+<\/jats:sup>\n                    and Ni\n                    <jats:sup>2+<\/jats:sup>\n                    to heterometallic Co\n                    <jats:sup>2+<\/jats:sup>\n                    \/V\n                    <jats:sup>3+<\/jats:sup>\n                    , Ni\n                    <jats:sup>2+<\/jats:sup>\n                    \/V\n                    <jats:sup>3+<\/jats:sup>\n                    , Co\n                    <jats:sup>2+<\/jats:sup>\n                    \/In\n                    <jats:sup>3+<\/jats:sup>\n                    , Co\n                    <jats:sup>2+<\/jats:sup>\n                    \/Ni\n                    <jats:sup>2+<\/jats:sup>\n                    . Cr\u2010MOFs remain highly crystalline in boiling water. Unprecedentedly, one Cr\u2010MOF can withstand the treatment cycle with 10\n                    <jats:sc>m<\/jats:sc>\n                    NaOH and 12\n                    <jats:sc>m<\/jats:sc>\n                    HCl, allowing reversible inter\u2010conversion between unbound \u2212COOH acid form and \u2212COO\n                    <jats:sup>\u2212<\/jats:sup>\n                    base form. These materials exhibit excellent sorption properties such as high uptake capacity for CO\n                    <jats:sub>2<\/jats:sub>\n                    (100.2 cm\n                    <jats:sup>3<\/jats:sup>\n                    \u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and hydrocarbon gases (e.g., 142.1 cm\n                    <jats:sup>3<\/jats:sup>\n                    \u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    for C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    , 110.5 cm\n                    <jats:sup>3<\/jats:sup>\n                    \u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    for C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    ) at 1 bar and 298K, high benzene\/cyclohexane selectivity (up to \u224840), and promising separation performance for gas mixtures such as C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    and 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                    .\n                  <\/jats:p>","DOI":"10.1002\/adma.202408042","type":"journal-article","created":{"date-parts":[[2024,8,15]],"date-time":"2024-08-15T23:55:45Z","timestamp":1723766145000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":69,"title":["Ultrastable Carboxyl\u2010Functionalized Pore\u2010Space\u2010Partitioned Metal\u2010Organic Frameworks for Gas Separation"],"prefix":"10.1002","volume":"36","author":[{"given":"Pooja","family":"Ajayan","sequence":"first","affiliation":[{"name":"Department of Chemistry University of California  Riverside California 92521 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of California  Riverside California 92521 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yichong","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of California  Riverside California 92521 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianhui","family":"Bu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry California State University  Long Beach California 90840 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3684-577X","authenticated-orcid":false,"given":"Pingyun","family":"Feng","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of California  Riverside California 92521 United 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