title: Synthesis and ion sensing properties of new colorimetric and fluorimetric chemosensors based on bithienyl-imidazo-anthraquinone chromophores.
abstract: Novel colorimetric receptors for fluoride ion sensing containing anthraquinone as a chromogenic signaling unit and imidazo-2,2'-bithiophene binding sites are reported. Well-defined color change was observed upon addition of fluoride ions to acetonitrile solutions of receptors 2. Compounds 2a-c, deprotonated after fluoride ion addition, were studied as metal ion chemosensors in the presence of Zn(II), Hg(II), and Cu(II) in acetonitrile solutions, especially compound 2a which displayed a marked change from pink to yellow-gold colors upon complexation.
authors.affiliation: Centro de Química, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
authors.forename: Rosa M F
authors.initials: RM
authors.lastname: Batista
authors.forename: Elisabete
authors.initials: E
authors.lastname: Oliveira
authors.forename: Susana P G
authors.initials: SP
authors.lastname: Costa
authors.forename: Carlos
authors.initials: C
authors.lastname: Lodeiro
authors.forename: M Manuela M
authors.initials: MM
authors.lastname: Raposo
mesh_terms: D000097:Acetonitriles; D000880:Anthraquinones; D003124:Colorimetry; D005459:Fluorides / Q000032:analysis*; D005470:Fluorometry; D007477:Ions / Q000032:analysis*; D008670:Metals / Q000032:analysis*; D015336:Molecular Probe Techniques; D012996:Solutions
chemical_list: D000097:Acetonitriles; D000880:Anthraquinones; D007477:Ions; D008670:Metals; D012996:Solutions; D005459:Fluorides; C032159:acetonitrile