title: Colorimetric recognition of acetate anions in aqueous solution using charge neutral azo derivatives.
abstract: Two novel highly sensitive colorimetric acetate anion receptors: 4-phenylazo-2-hydroxy-benzaldehyde 4-nitrophenylhydrazone (1) and 4-phenylazo-2-hydroxy-benzaldehyde 2,4-dinitrophenylhydrazone (2) based on azo derivative have been designed and synthesized. UV-vis experiments show that receptor 1 and receptor 2 can selectively recognize acetate in DMSO and even in 9/1 DMSO/H(2)O (v/v) mixtures. Meanwhile the color changes induced by anions can provide a way of detection by 'naked-eye'. The further insights to the nature of interactions between receptor 1, 2 and AcO(-) have been investigated by (1)H NMR titration experiments.
authors: Department of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
authors: Weiwei
authors: W
authors: Huang
authors: Yaping
authors: Y
authors: Li
authors: Hai
authors: H
authors: Lin
authors: Huakuan
authors: H
authors: Lin
mesh_terms: D000085:Acetates / Q000032:analysis*; D000838:Anions; D001391:Azo Compounds / Q000737:chemistry*; D003116:Color; D003124:Colorimetry / Q000379:methods*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry*
chemical_list: D000085:Acetates; D000838:Anions; D001391:Azo Compounds; D012996:Solutions; D014867:Water; D004121:Dimethyl Sulfoxide