Rapid and accurate detection of metal ions in aquatic environments is crucial for guaranteeing human well-being and environmental safety. Lanthanide metal-organic frameworks (MOFs) have emerged as a promising sensing platform due to their structural stability and unique luminescent properties. In this work, we successfully constructed a new lanthanide MOF by utilizing the unsymmetrical syringic acid linker. The presence of two distinct terminal binding moieties (—COOH and —OH) facilitates the formation of a new type of secondary building unit (SBU), and the Tb3 trigonal-prismatic SBUs are further connected by syringic acid linkers to form a framework with an acs topology. Benefiting from the characteristic green emission of Tb3+ and efficient antenna effect regulated by the unsymmetrical linker, the framework exhibits highly sensitive luminescence responses toward Fe3+ and Cu2+ ions in aqueous media. The corresponding limits of detection are determined to be as low as 0.375 and 0.894 µmol/L, respectively. Overall, this work provides a feasible route for developing luminescent lanthanide MOF-based sensors for metal detection.
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