title: Amino-Functionalized Metal-Organic Frameworks Nanoplates-Based Energy Transfer Probe for Highly Selective Fluorescence Detection of Free Chlorine.
abstract: Novel highly fluorescent NH2-MIL-53(Al) was controllably synthesized by a facile one-step hydrothermal treatment of AlCl3·6H2O and NH2-H2BDC in water with urea as a modulator. The as-synthesized NH2-MIL-53(Al) nanoplates exhibited excellent water solubility and stability. In the present work, it can be found that strong fluorescence of NH2-MIL-53(Al) nanoplates was significantly suppressed after the addition of free chlorine, and a simple sensing system for fast, highly selective direct detection of free chlorine in water was established. Compared with other fluorescent sensors for free chlorine, the present methodology has a comparable detection limit of 0.04 μM (S/N = 3) and a wide detection range of 0.05 to 15 μM. On the other hand, the traditional redox-based fluorescent probes sharply suffered from the interference of MnO4(-), Cr2O7(2-), and other oxidants with stronger oxidation capability than free chlorine while ours overcame this disadvantage. Further research suggests that it is more likely the energy transfer through N-H···O-Cl hydrogen bonding interaction between amino group and ClO(-) ions plays the key role in our system, providing a new and promising platform for free chlorine determination in water quality monitoring.
authors.affiliation: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Lu
authors.affiliation: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Lichun
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Mingxia
authors.initials: M
authors.lastname: Sun
authors.affiliation: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Dongyan
authors.initials: D
authors.lastname: Deng
authors.affiliation: Analytical & Testing Center, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Su
authors.affiliation: Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lv
mesh_terms: D002713:Chlorine / Q000032:analysis*; D004735:Energy Transfer; D008670:Metals / Q000737:chemistry*; D015335:Molecular Probes; D009930:Organic Chemicals / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D008670:Metals; D015335:Molecular Probes; D009930:Organic Chemicals; D002713:Chlorine