期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 8, 页码 7914-7926出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b18320
关键词
Ln-MOFs; flexible phenoxyl-containing tricarboxylate ligands; luminescent sensors; Fe(III) and Cr(VI); tunable light emission
资金
- National Natural Science Foundation of China [21571092, 21771095, 21671102]
- Natural Science Foundation of Shandong Province [ZR2012BQ023, ZR2017JL013]
- Natural Science Foundation of Jiangsu Province [BK20161538]
Two series of lanthanide metal organic frameworks (Ln-MOFs) from two structurally related flexible carboxylate-based ligands were solvothermally synthesized. H(3)L2 with additional -CH2- group provides more flexibility and different coordination modes and conformations compared with H(3)L1. As a result, 2-Ln MOFs are modulated from two-dimensional kgd of 1-Ln to three-dimensional rtl topological frameworks and further achieve enhanced chemical stability. The Eu- and Tb-MOFs exhibit strong fluorescent emission at the solid state because of the antenna effect of the ligands. Interestingly, the emissions can be tuned by simply doping Eu3+ and Tb3+ of different concentrations within the EuxTb1-x. MOFs. Notably, 2-Ln MOFs realize nearly white light emission by means of a trichromatic approach (red of Eu(III), green of Tb(III), and blue of the H(3)L2 ligand). Furthermore, 2-Ln MOFs also exhibit water stability and demonstrate high selective and sensitive sensing activities toward Fe(III) and Cr(VI) in aqueous solutions. The results further highlight the importance of the ligand flexibility on tuning MOF structures with improved sensing properties.
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