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The characterization techniques employed were Fourier\u2010transform infrared (FTIR), proton (<jats:sup>1<\/jats:sup>H)\u2010 and carbon\u201013 (<jats:sup>13<\/jats:sup>C)\u2010nuclear magnetic resonance (NMR) spectroscopy, electrospray ionization (ESI) mass spectrometry, and single crystal X\u2010ray diffraction analysis. Chemosensor <jats:bold>1<\/jats:bold> is composed of a <jats:italic>1H<\/jats:italic>\u2010imidazole core with specific substituents, including a 4\u2010(2\u2010(4,5\u2010c\u20102\u2010yl)naphthalene\u20103\u2010yloxy)butoxy)naphthalene\u20101\u2010yl moiety. However, chemosensor <jats:bold>2<\/jats:bold> features a <jats:italic>1H<\/jats:italic>\u2010imidazole core with distinct substituents, such as 4\u2010methyl\u20102\u2010(4,5\u2010diphenyl\u20101<jats:italic>H<\/jats:italic>\u2010imidazole\u20102\u2010yl)phenoxy)butoxy)\u20105\u2010methylphenyl. Chemosensor <jats:bold>1<\/jats:bold> crystallizes in the monoclinic space group C2\/c. Both chemosensors <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> exhibit a discernible fluorescence quenching response selectively toward iron(III) ion (Fe<jats:sup>3+<\/jats:sup>) at 435 and 390\u2009nm, respectively, in dimethylformamide (DMF) solutions, distinguishing them from other tested cations. This fluorescence quenching is attributed to the established mechanism of chelation quenched fluorescence (CHQF). The binding constants for the formation of the <jats:bold>1<\/jats:bold>\u2009+\u2009Fe<jats:sup>3+<\/jats:sup> and <jats:bold>2<\/jats:bold>\u2009+\u2009Fe<jats:sup>3+<\/jats:sup> complexes were determined using the modified Benesi\u2013Hildebrand equation, yielding values of approximately 2.2\u2009\u00d7\u200910<jats:sup>3<\/jats:sup> and 1.3\u2009\u00d7\u200910<jats:sup>4<\/jats:sup>\u2009M<jats:sup>\u22121<\/jats:sup>, respectively. The calculated average fluorescence lifetimes for <jats:bold>1<\/jats:bold> and <jats:bold>1<\/jats:bold>\u2009+\u2009Fe<jats:sup>3+<\/jats:sup> were 2.51 and 1.17\u2009ns, respectively, while for <jats:bold>2<\/jats:bold> and <jats:bold>2<\/jats:bold>\u2009+\u2009Fe<jats:sup>3+<\/jats:sup>, the lifetimes were 1.13 and 0.63\u2009ns, respectively. Additionally, the applicability of chemosensors <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> in detecting Fe<jats:sup>3+<\/jats:sup> in live cells was demonstrated, with negligible observed cell toxicity.<\/jats:p>","DOI":"10.1002\/bio.4694","type":"journal-article","created":{"date-parts":[[2024,2,28]],"date-time":"2024-02-28T02:24:30Z","timestamp":1709087070000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Performance of 4,5\u2010diphenyl\u20101<i>H<\/i>\u2010imidazole derived highly selective \u2018Turn\u2010Off\u2019 fluorescent chemosensor for iron(III) ions detection and biological applications"],"prefix":"10.1002","volume":"39","author":[{"given":"Praveena","family":"Rajendran","sequence":"first","affiliation":[{"name":"Department of Industrial Chemistry Alagappa University  Karaikudi 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