title: The first bifluoride sensor based on fluorescent enhancement.
abstract: The first fluorescent sensor for HF2(-) anion, N(1), N(3)-di(naphthalene-1-yl)isophthalamide (L) has been derived from α-Napthylamine and isopthaloyl chloride. In 1:1 (v/v) DMSO:H2O, L exhibits high selectivity towards HF2(-) anion with a 4-fold enhancement in fluorescent intensity. Very little enhancement in fluorescence intensity is observed for F(-), Cl(-), Br(-), I(-), SCN(-), PO4(3-), SO4(2-), and CH3COO(-) anions. The stoichiometry interaction between L and HF2 (-) is found to be 1:1 from fluorescence and UV/Visible spectral data. DFT calculation shows that binding between HF2(-) and L is 1:1 and increases the relative planarity between the two naphthyl rings causing fluorescence enhancement. A shift of 0.080 V in oxidation potential of L is observed on interaction with HF2(-) by cyclic voltammetry and square wave voltammetry.
authors.affiliation: Department of Chemistry, Gauhati University, Guwahati, 781014, Assam, India.
authors.forename: Kaku
authors.initials: K
authors.lastname: Dutta
authors.forename: Ramesh Ch
authors.initials: RCh
authors.lastname: Deka
authors.forename: Diganta Kumar
authors.initials: DK
authors.lastname: Das
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004563:Electrochemistry; D005459:Fluorides / Q000032:analysis* / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009281:Naphthalenes / Q000737:chemistry; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
chemical_list: D009281:Naphthalenes; D014867:Water; C031721:naphthalene; D005459:Fluorides; D004121:Dimethyl Sulfoxide