title: A highly selective chromogenic sensor for Mn2+, turn-off fluorometric for Hg2+ion, and turn-on fluorogenic sensor for F-ion with the practical application.
abstract: A colorimetric and fluorometric probe (E)-2-((8-hydroxy-1,2,3,5,6,7-hexahydropyrido[3,2,1-ij]quinolin-9-yl)methylene)hydrazinecarbothioamide based on thiosemicarbazide and julolidine moieties has been synthesised in pure crystalline form and characterized by1H NMR, UV-vis, elemental analysis and single crystal XRD. The probe functioned as multitarget ion sensor, detect biologically important metal ions Hg2+and Mn2+in dual channel mode. Meanwhile, in mixed solvent media DMF/H2O [8:2], probe displayed selectivity for Hg2+over other cations by the emission spectrum. Interestingly probe has been explored to recognize F-anion in DMF through ESIPT mechanism. The 1:1 binding stoichiometry of probe with Hg2+and Mn2+is confirmed by Job's plot through emission titration and UV-vis titration respectively. Probe is selective and sensitive to Hg2+and Mn2+with detection limit as low as 15μM and 0.2μM respectively. The sensing mechanism for selective ions was also scrutinized using1H NMR experiments and computational studies.
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: Neha
authors.initials: N
authors.lastname: Gupta
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: Divya
authors.initials: D
authors.lastname: Singhal
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India. Electronic address: akscyfcy@iitr.ernet.in.
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: Neetu
authors.initials: N
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: U P
authors.initials: UP
authors.lastname: Singh
keywords: Fluoride ion sensor; Manganese colorimetric sensor; Mercury fluorometric sensor; Thiosemicarbazones