title: Colorimetric detection of in situ metal acetates and fluorides by a bipyridyl-linked Schiff base.
abstract: Here, we present a new bipyridyl moiety linked Schiff base (bipy-1) that is well characterized using spectroscopic techniques. Colorimetric and UV-vis titrations were used to study the photophysical properties of bipy-1 in the presence of various tetrabutyl ammonium salt of anions and metal salts containing different counter cations. bipy-1 showed selective recognition of dimethyl sulphoxide solution of tetrabutyl ammonium salt of F(-) ion accompanied with a UV-vis band at 529 nm and interesting binding of aqueous Co, Ni, and Cu acetates/fluorides, as confirmed by distinct color changes from fluorescent green to pink or orange and a strong band around 480-510 nm in the UV-vis spectrum. However, in the presence of Co, Ni, and Cu countercations, any form of metal acetate/fluorides was found to be able to respond to similar color changes from fluorescent green to pink or orange, showing a band around 480-510 nm. This type of output clearly indicates that the in situ formation of Co, Ni, and Cu acetates/fluorides also coordinates with bipyridyl nitrogen atoms.
authors.affiliation: Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620 015, India.
authors.forename: Sivalingam
authors.initials: S
authors.lastname: Suganya
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Zo
authors.forename: Jong S
authors.initials: JS
authors.lastname: Park
authors.forename: Sivan
authors.initials: S
authors.lastname: Velmathi
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D000085:Acetates / Q000032:analysis*; D000838:Anions; D003116:Color; D003124:Colorimetry / Q000379:methods*; D005459:Fluorides / Q000032:analysis*; D008670:Metals / Q000032:analysis*; D066244:Proton Magnetic Resonance Spectroscopy; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012492:Salts / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000085:Acetates; D000838:Anions; D008670:Metals; D000644:Quaternary Ammonium Compounds; D012492:Salts; D012545:Schiff Bases; D015082:2,2'-Dipyridyl; C009405:tetrabutylammonium; D005459:Fluorides
keywords: bipyridyl Schiff base; colorimetric analysis; in situ analyte detection; metal acetate/fluoride