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A Water‐Stable Luminescent Zn II Metal‐Organic Framework as Chemosensor for High‐Efficiency Detection of Cr VI ‐Anions (Cr 2 O 7 2− and CrO 4 2− ) in Aqueous Solution
Author(s) -
Yao ZhaoQuan,
Li GuangYu,
Xu Jian,
Hu TongLiang,
Bu XianHe
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201705328
Subject(s) - luminescence , aqueous solution , detection limit , fluorescence , quenching (fluorescence) , metal ions in aqueous solution , ion , metal , chemistry , inorganic chemistry , materials science , analytical chemistry (journal) , chromatography , organic chemistry , optoelectronics , physics , quantum mechanics
A new luminescent Zn II ‐MOF with 1D triangular channels along the b axis, namely NUM‐5 , has been successfully assembled and well characterized, which features good stability, especially in aqueous solution. Interestingly, this compound exhibits a fast, sensitive and selective luminescence quenching response towards Cr VI (Cr 2 O 7 2− /CrO 4 2− ) in aqueous solution. The detection limits towards Cr 2 O 7 2− and CrO 4 2− ions are estimated to be 0.7 and 0.3 ppm, respectively, which are among the lowest detection limits reported for the MOF‐based fluorescent probes that can simultaneously detect Cr 2 O 7 2− and CrO 4 2− in aqueous environment. The possible detection mechanism has been discussed in detail. Moreover, it can be easily regenerated after detection experiments, indicative of excellent recyclability. All these results suggest NUM‐5 to be a highly selective and recyclable luminescent sensing material for the quantitative detection of Cr VI anions in aqueous solution.