Microporous Eu-MOF with Short 1,2,5-Thiadiazole-3,4-dicarboxylate Linkers: Luminescence Sensing of Nitrofuran Antibiotics and Gas Adsorption Performance

Lanthanide metal-organic frameworks combine the luminescent properties of rare earth elements with the structural tunability of molecular frameworks, making them ideal for multifunctional applications, such as luminescence sensing and gas separation. Herein, we report the synthesis of a red luminescent microporous Eu-MOF {[Eu₂(H₂O)L₃]·3H₂O}n using 1,2,5-thiadiazole-3,4-dicarboxylic acid (H₂L) as the sole ligand. The H₂L ligand features an effective antenna effect for energy transfer and structural rigidity, enabling the formation of a robust microporous framework. Detailed structural analysis revealed its highly ordered microporosity. The Eu-MOF exhibited excellent luminescence sensing performance for detecting nitrofuran antibiotics, including nitrofurantoin (NFN) and nitrofurazone (NTZ), demonstrating high selectivity, low detection limits, and short sensing response time (both within 6 s). Furthermore, the microporous structure of Eu-MOF endowed it with exceptional adsorption properties, enabling effective methane-acetylene separation.