Abstract

Comprehensive SummaryA luminescent lanthanide‐organic framework [Eu2(adip)(H2adip)(DMF)2]·CH3OH (1) was synthesized by a solvothermal method using anthracene‐based ligand 5,5’‐(anthracene‐9,10‐diyl)diisophthalic acid (H4adip). 1 possesses a 3D coordination framework, which could be rationalized as a 4,8‐connected 2‐nodal (416612)(4462) topological network. 1 shows an excellent linear increase in fluorescence intensity as the pH value rises from 4.8 to 7.1. Particularly, the fluorescence enhancement percentage reaches 588% for each increase of pH value, which is the highest value recorded for fluorescence pH sensing materials, promoting the sensitivity of pH detection within the physiological pH range. In addition, 1 can also specifically recognize carbon disulfide biomarkers 2‐thiothiazolidine‐4‐carboxylic acid (TTCA) and antibiotic aztreonam (ATM) by fluorescence quenching, with the KSV values of 1.02 × 105 L·mol–1 (0—10 μmol·L–1) and 4.67 × 105 L·mol–1 (0—50 μmol·L–1), the limit of detection (LOD) of 86 nmol·L–1 and 19 nmol·L–1, respectively. Among only a few cases reported, the detection sensitivities of 1 for both TTCA and ATM are the highest. The sensing mechanisms of pH, TTCA, and ATM are also discussed in detail.

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