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They can efficiently and selectively recognize and detect specific ions, making them powerful analytical tools for applications in environmental monitoring, biomedical fields, and more. In this work, we used a simple ligand to improve the coordination environment of Zn2+ ions and successfully synthesized a 3D coordination compound Zn(all-bdc)(Py) MOF through a straightforward hydrothermal method at low temperature. Additionally, we explored the potential of this MOF as a bifunctional ion fluorescence probe for both cationic and anionic recognition. The results showed that this 3D porous MOF exhibited excellent recognition ability for trivalent iron ions (Fe3+) and potassium permanganate (KMnO4\u2212) ions due to its highly porous structures and efficient ion recognition. When iron ions were added to 500 \u03bcL and potassium permanganate ions were added to 100 \u03bcL, the fluorescence of the compound was effectively quenched, and the detection limits for these two ions were 0.95 \u03bcM and 0.13 \u03bcM, respectively. The mixed-ion experiments also demonstrated that even in the presence of similar ions, this 3D MOF still maintained good selective recognition ability, specifically identifying Fe3+ and KMnO4\u2212 ions. This work provides a novel synthetic strategy for the design of MOFs capable of mixed-ion recognition and detection, expanding their application potential in ion sensing and analysis.<\/jats:p>","DOI":"10.3390\/ijms26083566","type":"journal-article","created":{"date-parts":[[2025,4,10]],"date-time":"2025-04-10T07:41:51Z","timestamp":1744270911000},"page":"3566","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Zn-Based Three-Dimensional Metal-Organic Framework for Selective Fluorescence Detection in Zwitterionic Ions"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4388-7233","authenticated-orcid":false,"given":"Hongbin","family":"Liu","sequence":"first","affiliation":[{"name":"Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yue","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biyi","family":"Huang","sequence":"additional","affiliation":[{"name":"Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Liu","sequence":"additional","affiliation":[{"name":"Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Putao","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Future Technology, Henan University, Kaifeng 475001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen","family":"Gu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tingli","family":"Ma","sequence":"additional","affiliation":[{"name":"Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology 2-4 Hibikino, Fukuoka 808-0196, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"216102","DOI":"10.1016\/j.ccr.2024.216102","article-title":"Metal-organic frameworks (MOFs) and MOF composites based biosensors","volume":"519","author":"Mohanty","year":"2024","journal-title":"Coord. 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