title: Ratiometric fluorescent chemosensor for fluoride ion based on inhibition of excited state intramolecular proton transfer.
abstract: ESIPT based benzimidazole derivative has been synthesized and investigated their photophysical behavior towards various anions. The probe 2 has been used for selective estimation of F(-) ions as compared to other anions and signaled the binding event through formation of new absorption band at 360nm and emission band at 420nm. The probe 2 showed fluorescence behavior towards fluoride ions through hydrogen bonding interactions and restricted the ESIPT emission at 540nm from OH to nitrogen of benzimidazole moiety to release its enol emission at 420nm.
authors.affiliation: School of Chemistry and Biochemistry, Thapar University, Patiala 147004, India.
authors.forename: Akul Sen
authors.initials: AS
authors.lastname: Gupta
authors.affiliation: School of Chemistry and Biochemistry, Thapar University, Patiala 147004, India.
authors.forename: Kamaldeep
authors.initials: K
authors.lastname: Paul
authors.affiliation: School of Chemistry and Biochemistry, Thapar University, Patiala 147004, India. Electronic address: vluxami@thapar.edu.
authors.forename: Vijay
authors.initials: V
authors.lastname: Luxami
mesh_terms: D001562:Benzimidazoles / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005459:Fluorides / Q000032:analysis*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D011522:Protons; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence
chemical_list: D001562:Benzimidazoles; D005456:Fluorescent Dyes; D011522:Protons; C031000:benzimidazole; D005459:Fluorides
keywords: Benzimidazole; Chemosensor; ESIPT; Fluorescence; TD-DFT