Two Stable Pillar-Layered Zn-LMOFs for Highly Fluorescence Sensing of Inorganic Pollutants and Nitro Aromatic Compounds in Water
Xueyue Yu, Baobing Tang, Wen Li, Dan Wang, Tiantian Sun, Lirong Zhang, Yunling Liu
Abstract
Luminescent metal–organic frameworks (LMOFs) are a potential class of functional materials for the photoluminescent detection of a wide range of analytes as well as for the detection of pollutants in wastewater. Herein, by using the pillar-layered strategy, two new luminescence Zn-LMOFs ( JLU-MOF222 and JLU-MOF223 ) were successfully solvothermal synthesized. The 2D layers are both consisting of Zn 2+ and TPHC [TPHC = (1,1′:2′,1″-terphenyl)-3,3″,4,4′,4″,5′-hexacarboxylic acid] ligands and then pillared by the different N-donor ligands to form the 3D Zn-LMOFs with fsh topology. Benefiting from the uncoordinated carboxylate sites, uncoordinated N atom, or -NH 2 group in the pillaring ligands and excellent stability in pH = 2–13 aqueous phase, JLU-MOF222 and JLU-MOF223 not only can sensitively detect trace amounts of inorganic pollutants (Fe 3+, Cr 2 O 7 2– ) and nitro aromatic compounds TNP and 2,4-DNP (TNP = 2,4,6- trinitrophenol, 2,4-DNP = 2,4-dinitrophenol) through luminescence quenching but also exhibit high selectivity of other anti-interference competing analytes. The two new Zn-LMOFs can be used as potential luminescent sensors for pollutant detection in water due to their high K SV and low limit of detection (LOD).