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In ethanol\u2010HEPES buffer (\n                    <jats:italic>V<\/jats:italic>\n                    \/\n                    <jats:italic>V<\/jats:italic>\n                    \u2009=\u20098:2, pH\u2009=\u20097.4), Cu\n                    <jats:sup>2+<\/jats:sup>\n                    was selectively detected by PYS through fluorescence enhancement with a binding constant of 7.5\u2009\u00d7\u200910\n                    <jats:sup>4<\/jats:sup>\n                    \u2009L\/mol and a detection limit of 9.3\u2009\u00d7\u200910\n                    <jats:sup>\u22128<\/jats:sup>\n                    \u2009mol\/L, demonstrating high sensitivity and anti\u2010interference capability. The resulting complex PYS\u2010Cu\n                    <jats:sup>2+<\/jats:sup>\n                    functioned as a probe for PA detection, exhibiting instantaneous response (2\u2009s) and high selectivity superior to other nitroaromatic compounds. The quenching mechanism was attributed to synergistic static quenching and inner filter effects, achieving a PA detection limit of 8.7\u2009\u00d7\u200910\n                    <jats:sup>\u22127<\/jats:sup>\n                    \u2009mol\/L, significantly below the permissible PA concentration (0.5\u2009mg\/L) specified in China's Surface Water Environmental Quality Standard (GB 3838\u20102002). Furthermore, a molecular logic gate system was successfully implemented using Cu\n                    <jats:sup>2+<\/jats:sup>\n                    and PA as chemical inputs, highlighting its potential for sensing applications.\n                  <\/jats:p>","DOI":"10.1002\/bio.70300","type":"journal-article","created":{"date-parts":[[2025,9,1]],"date-time":"2025-09-01T03:16:35Z","timestamp":1756696595000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Synthesis and Application of Pyrene\u2010Based Fluorescent Probe for the Continuous Detection of Cu\n                    <sup>2+<\/sup>\n                    and Picric Acid"],"prefix":"10.1002","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6125-2505","authenticated-orcid":false,"given":"Canyao","family":"Wu","sequence":"first","affiliation":[{"name":"Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Materials Science and Chemical Engineering Harbin University of Science and Technology  Harbin P. 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