title: 'Naked-eye' detection of biologically important anions in aqueous media by colorimetric receptor and its real life applications.
abstract: A colorimetric receptor R 2-[(2-Hydroxy-naphthalen-1-ylmethylene)-hydrazonomethyl]-quinolin-8-ol has been designed and synthesized with good yield and characterized by the standard spectroscopic techniques such as FT-IR, UV-Visible,1H NMR,13C NMR and ESI-MS. The receptor R showed naked-eye detection and spectral change in the presence of F-, AcO-and H2PO4-over other anions. Interestingly, receptor R displaying high selective recognition towards F-, AcO-ion with a drastic color change from pale yellow to red in dry DMSO solvent and orange in mixed solvent DMSO/H2O (9:1, v/v). The behavior of receptor R towards F-, AcO-ion was investigated using UV-Vis and1H NMR experiment. The detailed1H NMR experiment result revealed that the receptor R is forming the hydrogen bonding between imine nitrogen and phenolic OH proton towards anions. The receptor R is able to detect sodium salts of flouride (NaF) and acetate (NaAcO) in aqueous medium and it exhibited dramatic color change from pale yellow to red. The receptor R demonstrated itself to be useful for real life application by detecting flouride and acetate ion in sea-water and commercially available product such as toothpaste, mouthwash and vinegar solution.
authors.affiliation: Supramolecular Chemistry Laboratory, Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Srinivasnagar, - 575025, Karnataka, India.
authors.forename: Archana
authors.initials: A
authors.lastname: Singh
authors.affiliation: Supramolecular Chemistry Laboratory, Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Srinivasnagar, - 575025, Karnataka, India. Electronic address: darshak_rtrivedi@yahoo.co.in.
authors.forename: Darshak R
authors.initials: DR
authors.lastname: Trivedi
mesh_terms: D000838:Anions / Q000032:analysis*; D001391:Azo Compounds / Q000138:chemical synthesis / Q000737:chemistry; D002138:Calibration; D003116:Color; D003124:Colorimetry / Q000379:methods*; D005459:Fluorides / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D057230:Limit of Detection; D009067:Mouthwashes / Q000737:chemistry; D066244:Proton Magnetic Resonance Spectroscopy; D012623:Seawater / Q000737:chemistry; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry*
chemical_list: D000838:Anions; D001391:Azo Compounds; D009067:Mouthwashes; D012996:Solutions; D014867:Water; D005459:Fluorides
keywords: Acetate ion; Aqueous solution; Buffer study; Colorimetric sensor; Flouride ion; Real life application