title: A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base sensor for expeditious detection of Al(3+) and HSO3(-) in aqueous media.
abstract: A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base receptor (N(1)E,N(4)E)-N(1),N(4)-bis(pyridine-4-ylmethylene)benzene-1,4-diamine for the detection of both Al(3+) and HSO3(-) in aqueous medium has been developed. Receptor exhibits an excellent selective fluorescent-colorimetric response toward Al(3+). The sensitivity of the fluorescent based assay (0.903 μM) for Al(3+) is far below the limit recommended in the World Health Organization (WHO) guidelines for drinking water (7.41 μM). From (1)H NMR data, the Job plot and the ESI-MS spectrum, 1 : 2 stoichiometric complexation between and Al(3+) has been established. Receptor shows remarkable detection ability in a wide pH range of 4-11 and was successfully utilised in the determination of Al(3+) in aqueous solution of bovine serum albumin protein, and of HSO3(-) in real food samples. Moreover, shows a highly selective colorimetric response to HSO3(-) by changing its colour from yellow to colorless immediately without any interference from other anions.
authors.affiliation: Department of Chemistry, Guru Ghasidas Vishwavidyalaya, Bilaspur (C.G), India. patra29in@yahoo.co.in.
authors.forename: Anupam
authors.initials: A
authors.lastname: Ghorai
authors.forename: Jahangir
authors.initials: J
authors.lastname: Mondal
authors.forename: Rukmani
authors.initials: R
authors.lastname: Chandra
authors.forename: Goutam K
authors.initials: GK
authors.lastname: Patra
mesh_terms: D000535:Aluminum / Q000032:analysis*; D000818:Animals; D002412:Cations / Q000032:analysis; D002417:Cattle; D003124:Colorimetry / Q000379:methods; D005456:Fluorescent Dyes / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods; D057230:Limit of Detection; D008958:Models, Molecular; D010655:Phenylenediamines / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013447:Sulfites / Q000032:analysis*; D014867:Water / Q000032:analysis*
chemical_list: D002412:Cations; D005456:Fluorescent Dyes; D010655:Phenylenediamines; D011725:Pyridines; D012545:Schiff Bases; D013447:Sulfites; D014867:Water; D012710:Serum Albumin, Bovine; D000535:Aluminum; C042345:hydrogen sulfite; C029728:4-phenylenediamine