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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3588
Title: 1,8-Naphthyridinic fluorescent 'turn-on' and 'turn-off' chemosensors for detection of F- and Hg2+ ions mimicking INHIBIT molecular logic behaviour
Authors: Chahal M.K.
Sankar M.
Published in: Analytical Methods
Abstract: Two new receptors viz. 2-bromoacetamido-5,7-dimethyl-1,8-naphthyridine (1a) and 2-chloroacetamido-5,7-dimethyl-1,8-naphthyridine (1b) containing 1,8-naphthyridine as fluorophore unit have been designed and synthesised. These receptors exhibited very high selectivity for F- ions among the various anions tested such as H2PO4-, OAc-, Cl-, Br-, I-, HSO4-, PF6-, ClO4-, BF4- and NO3- owing to anion-induced deprotonation of the amide NH by F- ions. Among the various cations tested (Na+, Ag+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+ and Mn3+), 1a exhibited selective detection of Hg2+ ions by binding with N1 and N8 atoms of the naphthyridine moiety. Receptor 1a has been explored as a dual-ion detector for F- and Hg2+ ions in two contrasting modes (fluorescence 'turn-on' and 'turn-off') which is supported by spectroscopic and lifetime measurements. 1a exhibited lower detection limits for F- (0.4 ppm) and Hg2+ (2.4 ppm) ions. These receptors were recovered from anionic species of 1a formed after addition of F- ions by treating with protic solvents such as CH3OH. The mode of binding was also confirmed by spectroscopic and DFT studies. The chemical inputs of F- and Hg2+ ions generate an output which satisfies the condition of two-input INHIBIT logic operators. © The Royal Society of Chemistry.
Citation: Analytical Methods (2015), 7(11): 4552-4559
URI: https://doi.org/10.1039/c5ay00752f
http://repository.iitr.ac.in/handle/123456789/3588
Issue Date: 2015
Publisher: Royal Society of Chemistry
ISSN: 17599660
Author Scopus IDs: 55696261900
6701530390
Author Affiliations: Chahal, M.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Sankar, M., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Corresponding Author: Sankar, M.; Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email: sankafcy@iitr.ac.in
Appears in Collections:Journal Publications [CY]

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