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Trace NH\n                    <jats:sub>3<\/jats:sub>\n                    capture typically relies on chemisorption at Lewis acid sites or physisorption on porous adsorbents but usually suffers from irreversible binding, energy\u2010intensive regeneration, and structural degradation. In this work, for the first time, we demonstrate a new hydration pathway as a promising solution. In a Cu(II)\u2010pyrazolate framework, BUT\u201064(H\n                    <jats:sub>2<\/jats:sub>\n                    O), the bridging water molecules between adjacent Cu(II) ions serve as Br\u00f8nsted acid sites to hydrate ammonia, achieving a remarkable NH\n                    <jats:sub>3<\/jats:sub>\n                    packing density of 0.27\u00a0g cm\n                    <jats:sup>\u22123<\/jats:sup>\n                    at 0.1\u00a0kPa and an adsorption capacity of 1.51\u00a0mmol g\n                    <jats:sup>\u22121<\/jats:sup>\n                    for 1000\u00a0ppm NH\n                    <jats:sub>3<\/jats:sub>\n                    under 80% relative humidity, among the leading adsorbents. The reversible hydration mechanism combines enhanced NH\n                    <jats:sub>3<\/jats:sub>\n                    affinity with facile regeneration and mitigated moisture co\u2010adsorption, overcoming the inherent trade\u2010off. The remarkable alkaline stability of this material also highlights its potential as an energy\u2010efficient sorbent for trace NH\n                    <jats:sub>3<\/jats:sub>\n                    capture.\n                  <\/jats:p>","DOI":"10.1002\/anie.202507356","type":"journal-article","created":{"date-parts":[[2025,5,15]],"date-time":"2025-05-15T22:25:11Z","timestamp":1747347911000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Ammonia Hydration in a Cu(II)\u2010Pyrazolate Framework for Efficient Trace Capture"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6783-4390","authenticated-orcid":false,"given":"Guang\u2010Rui","family":"Si","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials Low\u2010Carbon Recycling Beijing University of Technology  Beijing 100124 China"},{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang\u2010Jing","family":"Kong","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"},{"name":"Department of Chemistry Northwestern University  Evanston Illinois 60208 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"He","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Low\u2010Carbon Recycling Beijing University of Technology  Beijing 100124 China"},{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia\u2010Teng","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin\u2010Hua","family":"Xie","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Low\u2010Carbon Recycling Beijing University of Technology  Beijing 100124 China"},{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8101-8493","authenticated-orcid":false,"given":"Jian\u2010Rong","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Low\u2010Carbon Recycling Beijing University of Technology  Beijing 100124 China"},{"name":"Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology  Beijing 100124 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,22]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1136674"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41561-019-0385-8"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abf8623"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.seppur.2012.07.014"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-022-28370-0"},{"key":"e_1_2_7_6_1","unstructured":"United States Department of Health and Human Services Toxicological profile for ammonia https:\/\/www.atsdr.cdc.gov\/toxprofiles\/tp126.pdf 2004. 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