Synthesis, structure, fluorescence, and probe properties of Y type tricarboxylic acid ligand europium complex

In order to better study the properties of rare earth europium complexes in terms of fluorescence and probes, in this work, 5-(4-carboxyphenoxy)isophthalic acid (H 3 cpipa) and rare metal ion Eu 3+ were used to synthesize metal complex by solvothermal reaction. Then complex [(Eu 2 (cpipa) 2 ·4H 2 O)·8H 2 O] n (1) was synthesized. Data on the structure acquired via an X-ray single-crystal diffractometer indicates that complex 1 is a three-dimensional network structure with a hollow structure. Moreover, solid-state fluorescence tests were carried out on H 3 cpipa and complex 1 . Fluorescence recognition studies were conducted on complex 1 in dispersed systems. The solid-state fluorescence results show that complex 1 has excellent fluorescence properties, with higher fluorescence intensity than the ligand, and it exhibits the bright characteristic red light of europium under fluorescent lamp. Fluorescence recognition studies have shown that complex 1 in dispersed systems serves as a fluorescent probe for both solvent molecule recognition and cation recognition. In solvent molecule systems, complex 1 exhibits good recognition of acetone, while in cation systems, complex 1 shows good selectivity for Fe 3+ ions