Detection Enhancement of One Multifunctional Cd-Metal–Organic Framework toward Tetracycline Antibiotics by Simply Mixing Eu<sup>3+</sup> in Suspension
Jiawei Cheng, Nana Liu, Luyao Wang, Huaiwei Wang, Jing Lü, Yun‐Wu Li, Jianmin Dou, Suna Wang
Abstract
It is necessary to find more simple methods to improve the detection selectivity and sensitivity of antibiotics. Herein, we constructed a novel three-dimensional (3D) Cd-MOF LCU-117 assembled from p -terphenyl-4,2″,5″,4′-tetracarboxylic acid, which showed a special 3D helical structure with carboxylic acid ligands and nitrogen-containing ligands crossing each other vertically. Luminescence measurements indicated that LCU-117 has high selectivity and sensitivity toward Eu 3+ through the ratiometric effect. Meanwhile, this complex itself could detect antibiotics oxytetracycline (OTC) through the turn-off mechanism. When Eu 3+ was added in suspensions of LCU-117 (noted as Eu 3+ @LCU-117 ), the detection toward OTC was enhanced significantly and visually. The sensing mechanism was investigated in detail by various measurements and theoretical calculations. LCU-117 has a good effect on the logic gate, potential fingerprint detection, and mixed-matrix membranes (MMMs). The practical application for monitoring OTC in water samples also provided a satisfactory result.