Construction of a Sensitive Fluorescence Sensor for Convenient 1-HP and UA Detection Relied on a Stable Eu-MOF

Herein, a new three-dimensional Eu-MOF, [Me2NH2]2[Eu3(mtptc)2(CH3COO)3]·DMA·H2O (1), has been elaborately prepared through the reaction of europium nitrate and a symmetric tetra-carboxylate ligand, 5′-methyl-[1,1′:3′,1″-triphenyl]-3,3″,5,5″-tetracarboxylic acid (H4mtptc). Noteworthily, compound 1 represents marked stability covering acid–base stability in the pH range of 2–14, thermal stability maintaining skeleton integrity when heated at 350 °C, solvent stability in some common solvents, and air stability in open air more than 4 weeks characterized by powder X-ray diffraction (XRD) and temperature-dependent powder XRD analyses. Remarkably, luminescent sensing measurements manifest that compound 1 is deemed as a hopeful fluorescent probe for rapid recognition of 1-hydroxypyrene (1-HP) and uric acid (UA) equipped with excellent sensitivity with a quenching efficiency of 99.1% for 1-HP and 97.4% for UA. Besides, the luminescent sensing performance of compound 1 toward 1-HP and UA possesses super stability in dimethylformamide/H2O solution, N-(2-hydroxyethyl)piperazine-N′-ethanesulfonic acid buffer solution, and human urine.