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A novel sensor, known as (E)\u20102\u2010((10\u2010octyl\u201010H\u2010phenothiazin\u20103\u2010yl)methylene)hydrazine\u20101\u2010carbothioamide (PTZHC), was synthesized as a fluorescence \u2018on\u2013off\u2019 sensor for Hg<jats:sup>2+<\/jats:sup> ions. Coordination alters organic molecule electron densities, quenching the fluorescence intensity. PTZHC was described completely with the help of FTIR and <jats:sup>1<\/jats:sup>H\u2010NMR spectrum studies. The Hg<jats:sup>2+<\/jats:sup> ion was successfully detected using the PTZHC sensor even when there were other metal ions present. The limit of the detection was estimated to be 2.5\u00a0\u00d7\u00a010<jats:sup>\u22128<\/jats:sup>\u00a0M and the Job's plot examination implied that PTZHC was bound to Hg<jats:sup>2+<\/jats:sup> with a simple 1:1 stoichiometry in s CH<jats:sub>3<\/jats:sub>CN\/H<jats:sub>2<\/jats:sub>O (9:1, v\/v) suspension. To further cast light on the bridged effect on geometric and optoelectronic characteristics, time\u2010dependent density functional theory (TD\u2010DFT) at the B3LYP\/6\u201031G(d) level and DFT were both examined.<\/jats:p>","DOI":"10.1002\/bio.4561","type":"journal-article","created":{"date-parts":[[2023,7,20]],"date-time":"2023-07-20T22:56:11Z","timestamp":1689893771000},"page":"1702-1710","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A \u2018turn\u2010off\u2019 fluorescence sensor for selective Hg(II) based on phenothiazine derivative"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7413-9115","authenticated-orcid":false,"given":"Fatimah A. 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