{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T15:56:00Z","timestamp":1791302160548,"version":"4.1.0"},"reference-count":54,"publisher":"American Chemical Society (ACS)","issue":"39","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100017170","name":"Thailand Science Research and Innovation","doi-asserted-by":"publisher","award":["4822005"],"award-info":[{"award-number":["4822005"]}],"id":[{"id":"10.13039\/501100017170","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004192","name":"National Science and Technology Development Agency","doi-asserted-by":"publisher","award":["NCR-NN-2568-24484-TH"],"award-info":[{"award-number":["NCR-NN-2568-24484-TH"]}],"id":[{"id":"10.13039\/501100004192","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004352","name":"Suranaree University of Technology","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004352","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,6]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>A bipyridine-functionalized covalent organic polymer (Bpy-COP) was synthesized as a fluorescent sensor for Zn2+ detection in pure water. Structural characterization confirmed the formation of an imine-linked amorphous polymer incorporating accessible bipyridine coordination sites within a conjugated framework. Upon Zn2+ coordination, Bpy-COP exhibited a pronounced fluorescence turn-on response, consistent with the combined effects of photoinduced electron transfer (PET) suppression and chelation-enhanced fluorescence (CHEF). DFT and TD-DFT calculations further supported the proposed PET suppression mechanism by indicating the thermodynamic feasibility of PET in the metal-free sensor and its suppression upon Zn2+ coordination. The sensor displayed a detection limit of 10 nM (0.67 ppb), a response-time of 30 s, and high selectivity toward Zn2+ over a broad range of competing metal ions. Unlike many previously reported fluorescent probes, Bpy-COP operates directly in pure water without the need for organic cosolvents. The sensor also exhibited reversible fluorescence switching over five Zn2+\/EDTA cycles and accurately determined Zn2+ in drinking water, tap water, and river water, with recoveries of 97\u2013105% and relative standard deviations below 2%. These results demonstrate that Bpy-COP provides a recyclable platform for selective Zn2+ sensing under fully aqueous conditions.<\/jats:p>","DOI":"10.1021\/acsomega.6c06357","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T03:02:17Z","timestamp":1790218937000},"page":"59714-59722","source":"Crossref","is-referenced-by-count":0,"title":["Bipyridine-Functionalized\nCovalent Organic Polymer\nfor Highly Sensitive Turn-On Fluorescent Detection of Zn2+ in Pure Water"],"prefix":"10.1021","volume":"11","author":[{"given":"Pornthip","family":"Piyanuch","sequence":"first","affiliation":[{"name":"National Science and Technology Development Agency (NSTDA) , , , ,","place":["Klong Luang, Pathum Thani, Thailand, 12120"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mekin","family":"Chuethaisong","sequence":"additional","affiliation":[{"name":"Suranaree University of Technology , , ,","place":["Nakhon Ratchasima, Thailand, 30000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mintada","family":"Kongnondang","sequence":"additional","affiliation":[{"name":"Suranaree University of Technology , , ,","place":["Nakhon Ratchasima, Thailand, 30000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1203-2686","authenticated-orcid":true,"given":"Anyanee","family":"Kamkaew","sequence":"additional","affiliation":[{"name":"Suranaree University of Technology , , ,","place":["Nakhon Ratchasima, Thailand, 30000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Supinya","family":"Nijpanich","sequence":"additional","affiliation":[{"name":"Synchrotron Light Research Institute (Public Organization) , ,","place":["Nakhon Ratchasima, Thailand, 30000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9069-4370","authenticated-orcid":true,"given":"Bunyarat","family":"Rungtaweevoranit","sequence":"additional","affiliation":[{"name":"National Science and Technology Development Agency (NSTDA) , , , ,","place":["Klong Luang, Pathum Thani, Thailand, 12120"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weerakanya","family":"Maneeprakorn","sequence":"additional","affiliation":[{"name":"National Science and Technology Development Agency (NSTDA) , , , ,","place":["Klong Luang, Pathum Thani, Thailand, 12120"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7823-3152","authenticated-orcid":true,"given":"Watchara","family":"Srimontree","sequence":"additional","affiliation":[{"name":"Suranaree University of Technology , , ,","place":["Nakhon Ratchasima, Thailand, 30000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"2026100610483893700_cit1","doi-asserted-by":"publisher","first-page":"590","DOI":"10.1021\/cr300508p","article-title":"Design strategies for water-soluble\nsmall molecular chromogenic and fluorogenic probes","volume":"114","author":"Li","year":"2014","journal-title":"Chem. 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