title: Ratiometric Zn2+ sensor and strategy for Hg2+ selective recognition by central metal ion replacement.
abstract: Strategies of both self-assembly and metal ion replacement were adopted in the development of new metal ion sensors for Zn2+ and Hg2+. Ligand BPBA, phenylene-bridged bis(pyrrol-2-ylmethyleneamine), could self-assemble to form a molecular square in the presence of Zn2+, which showed strong emission in solution. The fluorescent emission of formed BPBA-Zn2+ dropped with the addition of Hg2+. BPBA could be a good Zn2+ sensor candidate and BPBA-Zn2+ could be a good Hg2+ sensor candidate based on the mechanisms of the chelation-enhanced fluorescence effect and the replacement of central metal ion induced chelation-enhanced fluorescence quenching effect, respectively.
authors.affiliation: Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Wu
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jin Shi
authors.initials: JS
authors.lastname: Ma
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Yang
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D002614:Chelating Agents; D005453:Fluorescence; D008024:Ligands; D008628:Mercury / Q000032:analysis*; D012996:Solutions; D015032:Zinc / Q000032:analysis*
chemical_list: D002413:Cations, Divalent; D002614:Chelating Agents; D008024:Ligands; D012996:Solutions; D008628:Mercury; D015032:Zinc