Tb-doped Eu-MOF with significant luminescence in water for the detection of dopamine hydrochloride

A series of Eu x Tb 1-x L {Eu x Tb 1-x (5-bop) 3 (H 2 O) 4 } ∞ were synthesized using 3,5-dicarboxyphenylboronic acid (5-bop) as ligands via hydrothermal method. 5-bop ligand functions as an effective antenna, harvesting light and transferring the absorbed energy to both Eu 3+ and Tb 3+ . Tb 3+ acts as an intermediary donor, transferring a majority of its energy to the Eu 3+ . Eu 0.1 Tb 0.9 L is the best compound among Eu x Tb 1-x L series which exhibits excellent water stability and higher luminescence intensity compared to single-metal MOFs. It can selectively recognize dopamine hydrochloride (HDA) through fluorescence quenching, featuring fast response speed, high sensitivity, and strong resistance to interference. Additionally, the mechanisms responsible for the fluorescence quenching of Eu x Tb 1-x L include dynamic quenching and UV competitive absorption. This work provides an effective approach for the rapid and convenient detection of HDA in biological fluids.