Lanthanide-MOFs as multi-responsive photoluminescence sensor for sensitively detecting Fe 3+ , Cr 2 O 7 2− and nitrofuran antibiotics

• Published in: RSC advances 2023-08, Vol.13 (37), p.26196-26202
• Main Authors: Feng, Jingjuan, Kong, Cunding, Chen, Yunhui, Cen, Peipei, Ding, Yi, Guo, Yan, Zhang, Fengyuan, Liu, Xiangyu
• Format: Article
• Language: English
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/D3RA03817C

Fast and selective detection of contaminants plays a key role in meeting human health and environmental concerns. Herein, two groups of isostructural lanthanide MOFs, [Ln(Hpta)(oxalic acid)]·H 2 O (1-Eu, 2-Gd) and [Ln(pta)(oxalic acid) 0.5 (H 2 O) 2 ]·2H 2 O (3-Eu, 4-Gd) (H 2 pta = 2-(4-pyridyl)-terephthalic acid, C 2 O 4 − = oxalic acid), were synthesized by solvothermal method. Single crystal X-ray diffraction reveals that 1 and 2 are 3D neutral frameworks, while 3 and 4 consist of 2D layers with parallelogram holes and stack into 3D networks through O–H⋯N and O–H⋯O hydrogen bonding interactions. All complexes remain crystalline and stable below 400 °C, suggesting preeminent thermostability. Noteworthily, only 3 shows excellent chemical stability in water and organic solvent. Therefore, the solid-state fluorescence spectrum was used to characterize 3 which exhibited intense red luminescence. The N active sites in the pore channels of 3 are conducive to displaying a distinct quenching effect for Fe 3+ cations in aqueous solutions, Cr 2 O 7 2− anions in DMF and DMA solutions, and nitrofuran antibiotics in the DMF solvent. Overall, 3 is a prospective luminescent sensor for detecting Fe 3+ , Cr 2 O 7 2− and nitrofuran antibiotics.