title: Heterometal-organic frameworks as highly sensitive and highly selective luminescent probes to detect I⁻ ions in aqueous solutions.
abstract: Two cationic heterometal-organic frameworks (Eu-Zn (1·NO₃⁻) and Tb-Zn (2·NO₃⁻)) with NO3(-) counter-anions in the channels are structurally and luminously characterized. Both of them can serve as highly sensitive and highly selective luminescent probes for detecting I(-) ions in aqueous solutions. In particular, 2·NO₃⁻ can selectively and reversibly detect I(-) with a fast response time of just 10 s and an extremely low detection limit of 0.001 ppm. Mechanism studies reveal that I(-) is quickly oxidized to form I₃⁻with the help of 1·NO₃⁻ or 2·NO₃⁻, leading to luminescence quenching. This represents the first report of MOF-based luminescent probes for the detection of I(-) in aqueous solutions.
authors.affiliation: Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, P. R. China. zhaobin@nankai.edu.cn.
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Shi
authors.forename: Huan-Cheng
authors.initials: HC
authors.lastname: Hu
authors.forename: Zhan-Yun
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Xiong
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
mesh_terms: D007455:Iodine / Q000032:analysis* / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D012996:Solutions; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D009942:Organometallic Compounds; D012996:Solutions; D014867:Water; D013725:Terbium; D007455:Iodine