1. Luminescent lanthanide complexes based on 4,5-di(3,5-dicarboxylphenoxy)phthalic acid as enhanced fluorescence probes for highly selective detection of lead(II) ions in water.
- Author
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Wei, Wenwen, Wang, Ai, Lu, Liping, Yuan, Caixia, Feng, Sisi, Englert, Ulli, and Ma, Shengqian
- Subjects
PHTHALIC acid ,LEAD ,FLUORESCENCE ,WATER sampling ,IONS ,COUMARINS ,FLUORESCENT probes - Abstract
Six novel lanthanide complexes ([Nd
2 (L)(H2 O)6 ]n ·4.58n(H2 O) (1), [Ln(H3 L)(H2 O)]n ·0.5n(H2 O), Ln = Sm (2), Eu (3), Gd (4), Tb (5), Eu0.18 Gd0.62 Tb0.20 (6)) have been hydrothermally synthesized based on the ligand 4,5-di(3,5-dicarboxylphenoxy)phthalic acid (H6 L). Single crystal X-ray diffraction reveals that complexes 1–6 are 2D structures, where 2–6 are isomorphic. Complexes 3 and 5 exhibit the characteristic fluorescence of Eu(III) and Tb(III) ions respectively, while complex 4 shows blue-green light emission based on the ligand. In particular, the ternary Eu/Gd/Tb complex 6 shows white light emission with a CIE (Commission International del'Eclairage) chromaticity coordinate of (0.330, 0.339) and hence close to pure white light emission. Moreover, complexes 3 and 5 display specific fluorescence-enhanced detection performance for Pb2+ ions: The interaction between Pb2+ ions and the ligand enhances the charge transfer efficiency between the ligand and the Eu(III) and Tb(III) ions and thus leads to fluorescence enhancement of complexes 3 and 5. More importantly, complex 3 exhibits the lowest detection limit of 4.72 nM for Pb2+ ions among the existing complex fluorescent probes. In addition, both complexes 3 and 5 show good performance for recycling and for the detection of Pb2+ in real water samples. [ABSTRACT FROM AUTHOR]- Published
- 2024
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