Hydrogen-Bond-Connected 2D Zn-LMOF with Fluorescent Sensing for Inorganic Pollutants and Nitro Aromatic Explosives in the Aqueous Phase
Wenhao Liu, Junyi Qiao, Jiaming Gu, Yunling Liu
Abstract
Herein, a novel luminescent Zn-LMOF, JLU-MOF109 ([Zn(PBBA)(H 2 O)]·3DMF·2H 2 O, PBBA = 4,4′-(2,6-pyrazinediyl)bis[benzoic acid], DMF = N, N -dimethylformamide), was successfully synthesized under solvothermal conditions. Zinc ions are connected by PBBA ligands to form two-dimensional (2D) layers, and the layers are further propped up through hydrogen-bonding interactions. JLU-MOF109 exhibits good sensitivity to inorganic pollutants, Fe 3+ and Cr 2 O 7 2–, as well as nitro aromatic explosives, 2,4,6-trinitrophenol and 2,4-dinitrophenol. JLU-MOF109 exhibits high K sv (at 10 4 M –1 level) and low limit of detection values (∼10 –6 mol/L) for the abovementioned hazardous pollutants, which is better than a majority of previously reported MOF-based fluorescent sensors. With good stability in the aqueous phase, JLU-MOF109 can serve as a promising chemical sensor for pollutant detection in wastewater.