title: Lead as own luminescent sensor for determination.
abstract: In our experiments, it was observed that adding bromide to Pb2+ solution of N,N'-dimethylformamide (DMF), the highly emissive cluster Pb4Br11(3-) can be formed and the fluorescence intensity of the formed cluster is proportional to the concentration of Pb2+, based on which, a novel, simple approach that uses the emission from itself as the sensor for determination of Pb2+ is proposed. Under the optimum conditions, the linear range and detection limit is 1.0 x 10(-7) to 1.0 x 10(-5) mol l(-1) (correlation coefficient r = 0.9997) and 7.6 x 10(-9) mol l(-1), respectively. Foreign substrates effects were also investigated. The proposed method has been successfully applied to the determination of lead in the synthetic samples. The mechanism of the reaction is also studied.
authors.affiliation: College of Chemistry & Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
authors.forename: Hongying
authors.initials: H
authors.lastname: Duan
authors.forename: Xinping
authors.initials: X
authors.lastname: Ai
authors.forename: Zhike
authors.initials: Z
authors.lastname: He
mesh_terms: D002413:Cations, Divalent / Q000032:analysis / Q000737:chemistry; D004126:Dimethylformamide / Q000737:chemistry; D007854:Lead / Q000032:analysis* / Q000737:chemistry*; D049449:Luminescence; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D002413:Cations, Divalent; D000644:Quaternary Ammonium Compounds; C032721:lead bromide; D007854:Lead; D004126:Dimethylformamide; C009405:tetrabutylammonium