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While metal\u2013organic Frameworks (MOFs) offer new opportunities for the capture of this type of compound, colorimetric detection is rare, and a chemically stable material that presents both selective adsorption and colorimetric chemosensing potential under environmental conditions is almost non\u2010existent. We present here the synthesis and crystal structure of a new Zr\n                    <jats:sub>12<\/jats:sub>\n                    oxocluster carboxylate\u2010based MOF, MIP\u2010216(Zr) ([Zr\n                    <jats:sub>12<\/jats:sub>\n                    (\u03bc\n                    <jats:sub>3<\/jats:sub>\n                    \u2010O)\n                    <jats:sub>8<\/jats:sub>\n                    (\u03bc\n                    <jats:sub>3<\/jats:sub>\n                    \u2010OH)\n                    <jats:sub>8<\/jats:sub>\n                    (\u03bc\n                    <jats:sub>2<\/jats:sub>\n                    \u2010OH)\n                    <jats:sub>6<\/jats:sub>\n                    (formate)\n                    <jats:sub>6<\/jats:sub>\n                    (L1)\n                    <jats:sub>6<\/jats:sub>\n                    ], L1: 4,4\u2019\u2010(hexafluoroisopropylidene)bis(benzoic acid). MIP\u2010216(Zr) features specific properties such as a dual pore system with hydrophobic microporous large channels and hydrophilic small pores leading to an unprecedented ability to capture traces of acetic acid under ambient conditions. Its pores were then loaded with the crossover iron complex [Fe\n                    <jats:sup>II<\/jats:sup>\n                    (L2)\n                    <jats:sub>2<\/jats:sub>\n                    ] (L2: 4\u2010amino\u2010, 2\u2010(2\u2010pyridinylmethylene)hydrazide) (\n                    <jats:bold>1<\/jats:bold>\n                    ), leading to the (\n                    <jats:bold>1<\/jats:bold>\n                    )\u2282MIP\u2010216(Zr) compound that presents a pronounced solvatochromic effect upon acetic acid vapor sorption, associated with the spin\u2010state change of the encapsulated complex. We finally illustrate the high potential of this compound for acetic acid colorimetric sensing at low concentrations, demonstrating a rapid, visible, and selective response under ambient conditions that highlights its relevance for real\u2010world monitoring applications.\n                  <\/jats:p>","DOI":"10.1002\/anie.6731372","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T17:39:27Z","timestamp":1783964367000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A New Switchable Zr\n                    <sub>12<\/sub>\n                    Oxocluster Based Large Pore Metal\u2013Organic Framework Functionalized With Spin Crossover Complexes for Acetic Acid Colorimetric Sensing"],"prefix":"10.1002","volume":"65","author":[{"given":"Emmelyne","family":"Cuza","sequence":"first","affiliation":[{"name":"Institut Des Mat\u00e9riaux Poreux De Paris UMR 8004 CNRS, Ecole Normale Sup\u00e9rieure Ecole Sup\u00e9rieure de Physique et de Chimie Industrielles de Paris PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenchen","family":"Cao","sequence":"additional","affiliation":[{"name":"Institut Des Mat\u00e9riaux Poreux De Paris UMR 8004 CNRS, Ecole Normale Sup\u00e9rieure Ecole Sup\u00e9rieure de Physique et de Chimie Industrielles de Paris PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9212-1269","authenticated-orcid":false,"given":"Abeer","family":"Mohtar","sequence":"additional","affiliation":[{"name":"CERENA. Departamento de Engenharia Qu\u00edmica Instituto Superior T\u00e9cnico Universidade De Lisboa  Lisboa Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad","family":"Wahiduzzaman","sequence":"additional","affiliation":[{"name":"ICGM, University of Montpellier CNRS ENSCM Montpellier France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Shepard","sequence":"additional","affiliation":[{"name":"Synchrotron SOLEIL L'Orme des Merisiers  Saint\u2010Aubin France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2096-0450","authenticated-orcid":false,"given":"Guillaume","family":"Maurin","sequence":"additional","affiliation":[{"name":"ICGM, University of Montpellier CNRS ENSCM Montpellier France"},{"name":"Institut Universitaire de France  France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Moises L.","family":"Pinto","sequence":"additional","affiliation":[{"name":"CERENA. Departamento de Engenharia Qu\u00edmica Instituto Superior T\u00e9cnico Universidade De Lisboa  Lisboa Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3040-2564","authenticated-orcid":false,"given":"Christian","family":"Serre","sequence":"additional","affiliation":[{"name":"Institut Des Mat\u00e9riaux Poreux De Paris UMR 8004 CNRS, Ecole Normale Sup\u00e9rieure Ecole Sup\u00e9rieure de Physique et de Chimie Industrielles de Paris PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1528-7641","authenticated-orcid":false,"given":"Antoine","family":"Tissot","sequence":"additional","affiliation":[{"name":"Institut Des Mat\u00e9riaux Poreux De Paris UMR 8004 CNRS, Ecole Normale Sup\u00e9rieure Ecole Sup\u00e9rieure de Physique et de Chimie Industrielles de Paris PSL University  Paris France"},{"name":"ICMMO Universit\u00e9 Paris\u2010Saclay CNRS  Orsay 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