{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T22:37:09Z","timestamp":1776292629644,"version":"3.50.1"},"reference-count":89,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2022,12,30]],"date-time":"2022-12-30T00:00:00Z","timestamp":1672358400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Science Fund, Ministry of Education and Science of Bulgaria","award":["K\u03a0-06-H49\/2"],"award-info":[{"award-number":["K\u03a0-06-H49\/2"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A novel diamino triazine based 1,8-naphthalimide (NI-DAT) has been designed and synthesized. Its photophysical properties have been investigated in different solvents and its sensory capability evaluated. The fluorescence emission of NI-DAT is significantly impacted by the solvent polarity due to its inherent intramolecular charge transfer character. Moreover, the fluorescence emission quenched at higher pH as a result of photo-induced electron transfer (PET) from triazine moiety to 1,8-naphthalimide after cleaving hydrogen bonds in the self-associated dimers. Furthermore, the new chemosensor exhibited a good selectivity and sensitivity towards Hg2+ among all the used various cations and anions in the aqueous solution of ethanol (5:1, v\/v, pH = 7.2, Tampon buffer). NI-DAT emission at 540 nm was quenched remarkably only by Hg2+, even in the presence of other cations or anions as interfering analytes. Job\u2019s plot revealed a 2:1 stoichiometric ratio for NI-DAT\/Hg2+ complex, respectively.<\/jats:p>","DOI":"10.3390\/s23010399","type":"journal-article","created":{"date-parts":[[2023,1,2]],"date-time":"2023-01-02T03:08:59Z","timestamp":1672628939000},"page":"399","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Self-Associated 1,8-Naphthalimide as a Selective Fluorescent Chemosensor for Detection of High pH in Aqueous Solutions and Their Hg2+ Contamination"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0997-1693","authenticated-orcid":false,"given":"Awad I.","family":"Said","sequence":"first","affiliation":[{"name":"Faculty of Medicine, Sofia University \u201cSt. Kliment Ohridski\u201d, 1407 Sofia, Bulgaria"},{"name":"Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7556-1222","authenticated-orcid":false,"given":"Desislava","family":"Staneva","sequence":"additional","affiliation":[{"name":"Department of Textile, Leather and Fuels, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4717-8028","authenticated-orcid":false,"given":"Silvia","family":"Angelova","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies \u201cAcad. J. Malinowski\u201d, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7204-8183","authenticated-orcid":false,"given":"Ivo","family":"Grabchev","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Sofia University \u201cSt. Kliment Ohridski\u201d, 1407 Sofia, Bulgaria"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,30]]},"reference":[{"key":"ref_1","unstructured":"Jasinski, S.M. (2022, June 05). The Materials Flow of Mercury in the United States, Available online: https:\/\/pubs.usgs.gov\/usbmic\/ic-9412\/mercury.pdf."},{"key":"ref_2","unstructured":"Ballantyne, B., Mars, C.T., and Syversen, T. (2000). Metal toxicology. 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