{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T12:15:36Z","timestamp":1762431336749,"version":"build-2065373602"},"reference-count":26,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2017,10,27]],"date-time":"2017-10-27T00:00:00Z","timestamp":1509062400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Stable zwitterionic spirocyclic Meisenheimer compounds were synthesized using a one-step reaction between picric acid and diisopropyl (ZW1) or dicyclohexyl (ZW3) carbodiimide. A solution of these compounds displays intense orange fluorescence upon UV or visible light excitation, which can be quenched or \u201cturned-off\u201d by adding a mole equivalent amount of F\u2212 or CN\u2212 ions in acetonitrile. Fluorescence is not quenched in the presence of other ions such as Cl\u2212, Br\u2212, I\u2212, NO2\u2212, NO3\u2212, or H2PO4\u2212. These compounds can therefore be utilized as practical colorimetric and fluorescent probes for monitoring the presence of F\u2212 or CN\u2212 anions.<\/jats:p>","DOI":"10.3390\/molecules22111842","type":"journal-article","created":{"date-parts":[[2017,10,27]],"date-time":"2017-10-27T11:33:28Z","timestamp":1509104008000},"page":"1842","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Fluorescent \u201cTurn-Off\u201d Detection of Fluoride and Cyanide Ions Using Zwitterionic Spirocyclic Meisenheimer Compounds"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9809-2796","authenticated-orcid":false,"given":"Marina","family":"Benet","sequence":"first","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9106-5405","authenticated-orcid":false,"given":"Marc","family":"Villabona","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7423-6233","authenticated-orcid":false,"given":"Carles","family":"Llavina","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2800-2388","authenticated-orcid":false,"given":"Silvia","family":"Mena","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1126-4138","authenticated-orcid":false,"given":"Jordi","family":"Hernando","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8429-2802","authenticated-orcid":false,"given":"Rabih O.","family":"Al-Kaysi","sequence":"additional","affiliation":[{"name":"College of Science and Health Professions-3124, King Saud bin Abdulaziz University for Health Sciences\/King Abdullah International Medical Research Center, Ministry of National Guard Health Affairs, 11426 Riyadh, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2128-7007","authenticated-orcid":false,"given":"Gonzalo","family":"Guirado","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica, Universitat Aut\u00f2noma de Barcelona, E-08193 Bellaterra, 08193 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,10,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1011","DOI":"10.1021\/cr0501341","article-title":"Spiro Compounds for Organic Optoelectronics","volume":"107","author":"Saragi","year":"2007","journal-title":"Chem. 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