title: Anion/cation induced optical switches based on luminescent lanthanide (Tb3+ and Eu3+) hydrogels.
abstract: Two novel silica based lanthanide complexes (Tb(a)(2) and Eu(a)(2)) were encapsulated into poly(acrylic acid) host. Both Tb(III) and Eu(III) containing hydrogels have typical and easily distinguished narrow line emissions occurring in the green and red region respectively. Particularly, the excitation wavelength for Eu complex can be extended into nearly visible light range (λ(ex) = 395 nm). Interestingly, we discover that these target materials not only exhibit selective emission response towards HSO(4)(-) (detection limit 10(-5) M) compared with CH(3)COO(-), F(-), Cl(-), Br(-) and I(-) but also give unique quenching to Cu(2+) (detection limit 10(-5) M) (tested cations: Cu(2+), Pd(2+), Cd(2+), Co(2+) and Mn(2+)). More importantly, this kind of materials can be recycled more than 10 times.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou, China.
authors.forename: Liguo
authors.initials: L
authors.lastname: Zhang
authors.forename: Chaoliang
authors.initials: C
authors.lastname: Tan
authors.forename: Qianming
authors.initials: Q
authors.lastname: Wang
authors.forename: Cheng Cheng
authors.initials: CC
authors.lastname: Zhang
mesh_terms: D000838:Anions; D002412:Cations; D002853:Chromatography, Liquid; D003300:Copper / Q000032:analysis*; D005063:Europium / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements; D013058:Mass Spectrometry; D055668:Photochemical Processes / Q000528:radiation effects; D013050:Spectrometry, Fluorescence; D013455:Sulfur / Q000032:analysis*; D013725:Terbium / Q000737:chemistry*
chemical_list: D000838:Anions; D002412:Cations; D020100:Hydrogels; D013725:Terbium; D005063:Europium; D013455:Sulfur; D003300:Copper