title: Highly selective mercury(II) cations detection in mixed-aqueous media by a ferrocene-based fluorescent receptor.
abstract: A new chemosensor molecule 3 based on a ferrocene-imidazophenanthrophenazine dyad effectively recognizes Hg(2+) in an aqueous environment through three different channels. Upon recognition, an anodic shift of the ferrocene-ferrocenium oxidation potential (ΔE(1/2) = 240 mV) and a progressive red shift (Δλ = 17 nm) of the low energy band in its absorption spectrum is produced. The emission spectrum of 3 in an aqueous environment, CH(3)CN-EtOH-H(2)O (65:25:10), and conducted at pH = 7.4 (20 × 10(-3) M HEPES) (Φ = 0.003), is perturbed after addition of Hg(2+) cations and an intense and structureless red shift emission band at 494 nm (Δλ = 92 nm) appeared along with an increase of the intensity of the emission band (CHEF = 77), the quantum yield (Φ = 0.054) resulted in a 18-fold increase. The combined (1)H NMR data of the complex and the theoretical calculations suggest the proposed bridging coordination mode.
authors.affiliation: Departamento de Química Orgánica, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain.
authors.forename: María
authors.initials: M
authors.lastname: Alfonso
authors.forename: Julia
authors.initials: J
authors.lastname: Contreras-García
authors.forename: Arturo
authors.initials: A
authors.lastname: Espinosa
authors.forename: Alberto
authors.initials: A
authors.lastname: Tárraga
authors.forename: Pedro
authors.initials: P
authors.lastname: Molina
mesh_terms: D002412:Cations / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D055664:Electrochemical Techniques; D005296:Ferrous Compounds / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D000075163:Metallocenes; D008958:Models, Molecular; D010084:Oxidation-Reduction; D010619:Phenazines / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D005296:Ferrous Compounds; D005456:Fluorescent Dyes; D000075163:Metallocenes; D010619:Phenazines; D014867:Water; D008628:Mercury; C004998:ferrocene