A novel stable 3D luminescent uranyl complex for highly efficient and sensitive recognition of Ru³⁺ and biomolecules

Highlights: • A novel highly stable 3D luminescent uranyl complex was synthesized by uranyl salt and a glycine-derivative ligand for the first time. • The complex was characterized with different techniques: SXRD, IR, PXRD, EA, TGA, UV, Fluorescent spectra. • Complex 1 could be acted as an efficient luminescent probe selectively detecting Ru³⁺ and biomolecules (DA, AA, UA and BSA). • The framework structure of complex 1 still remains highly stable after quenching. - Abstract: A novel highly stable 3D luminescent uranyl coordination polymer, namely {[UO₂(L)]·DMA}_n (1), was assembled with uranyl salt and a glycine-derivative ligand [6-(carboxymethyl-amino)-4-oxo-4,5-dihydro-[1,3,5]triazin-2-ylamino]-acetic acid (H₂L) under solvothermal reaction. Besides, It was found that complex 1 possesses excellent luminescent properties, particularly the efficient selectivity and sensitivity in the recognition of Ru³⁺, biomacromolecule bovine serum albumin (BSA), biological small molecules dopamine (DA), ascorbic acid (AA) and uric acid (UA) in the water solution based on a "turn-off" mechanism. Accordingly, the luminescent explorations also demonstrated that complex 1 could be acted as an efficient luminescent probe with high quenching efficiency and low detection limit for selectively detecting Ru³⁺ and biomolecules (DA, AA, UA and BSA). It was noted that the framework structure of complex 1 still remains highly stable after quenching, which was verified by powder X-ray diffraction (PXRD).