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However, conventional Ge\/Sn\/Pb\u2010based systems remain limited by narrow bandgaps and poor moisture stability. In this work, we report the first 2D chiral hybrid fluorozirconate, (\n                    <jats:italic>R\/S<\/jats:italic>\n                    \u2010MBA)ZrF\n                    <jats:sub>5<\/jats:sub>\n                    (MBA = methylbenzylammonium), addressing these limitations through reversed quantum\u2010well engineering enabled by a high\u2010valent Zr\u2500F framework. It features a unique reversed Type\u2010I quantum\u2010well electronic structure, where the [ZrF\n                    <jats:sub>5<\/jats:sub>\n                    ] inorganic layer acts as a dielectric barrier and the band\u2010edge states are localized on the organic MBA cations. This structure yields a wide bandgap of 4.60\u00a0eV, a short UV cutoff edge of 265\u00a0nm, and a high laser\u2010induced damage threshold exceeding 1251.58 GW\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , providing a broad transparency window toward the UV region. Furthermore, (\n                    <jats:italic>R\/S<\/jats:italic>\n                    \u2010MBA)ZrF\n                    <jats:sub>5<\/jats:sub>\n                    exhibits a large SHG circular dichroism (SHG\u2010CD) response with an anisotropy factor of 1.05. More importantly, it overcomes the typical moisture\u2010sensitivity of OIHMHs, maintaining its structural stability and SHG\u2010CD response after a 7\u2010day water immersion. Structural analysis and theoretical calculations reveal this unusual water resistance is mainly attributed to the robust Zr\u2500F framework and an effective cavity volume of 3.6%. This work highlights reversed quantum\u2010well engineering as a novel way to synthesize water\u2010stable and wide bandgap chiral nonlinear optical materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.7041180","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T15:17:25Z","timestamp":1785943045000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reversed Quantum\u2010Well Engineering Unlocks Large Ultraviolet Chiral Nonlinear Optical Response in a Water\u2010Resistant 2D Hybrid Fluorozirconate"],"prefix":"10.1002","volume":"65","author":[{"given":"Jia\u2010Hang","family":"Wu","sequence":"first","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang\u2010Qiang","family":"Bi","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming\u2010Zhi","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yue","family":"Zhao","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhao\u2010Rui","family":"Hua","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun\u2010Li","family":"Hu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Functional Crystals and Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8673-0204","authenticated-orcid":false,"given":"Zhi\u2010Chao","family":"Huang\u2010Fu","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4258-8733","authenticated-orcid":false,"given":"Yu\u2010Meng","family":"You","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9400-9740","authenticated-orcid":false,"given":"Wen","family":"Zhang","sequence":"additional","affiliation":[{"name":"Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics School of Chemistry and Chemical Engineering Southeast University  Nanjing Jiangsu P. R. 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