Journal
CRYSTAL GROWTH & DESIGN
Volume 17, Issue 5, Pages 2746-2756Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.7b00219
Keywords
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Funding
- National Natural Science Foundation of China [21371040, 21571042]
- National Key Basic Research Program of China (973 Program) [2013CB632900]
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Four novel compounds {[In(FDA)(HFDA)-(H2O4] center dot 2H(2)O} (Inl.) and I [Ln(2)(FDA)(2)(H2O)(10)]center dot FDA center dot 6H(2)O} (Ln = Dy2, Eu3, Gd4) have been hydrothermally synthesized by using the ligand furan-2,5-dicarboxylic acid (H(2)FDA). Driven by hydrogen bonding and pi...pi stacking, In1 displays a supramolecular metal-organic framework (MOF) with 6-connected pcu topology. Isostructural Dy2, Eu3, and exhibit bnn topological structures with the Schlafli symbol of Gd4 possess one-dimensional wave-like chains and further (4(6).6(4)) via a hydrogen bonding network. The triplet state (T-1 = 22371 cm(-1)) of H(2)FAD studied by compound Gd4 indicates that the energy transition from the H(2)FDA ligand to the Eu3 ion in compound Eu3 is efficient but inefficient to the Dy3+ ion in compound Dy2. Interestingly, the uncoordinated carbonyl group of compound In1 can sensitize Ln(3+) ions to obtain Dy3+@In1 and Eu3+@In1 materials for enhancing luminescence. The possible sensitization mechanism is studied by X-ray photoelectron spectroscopy and surface photovoltage spectroscopy. When the Eu3 ion is increased from 0.0 to 1.6 mu M in aqueous solution, compound In1 exhibits a distinguishable luminescence color change from blue to red with a fast detection time (<2 min), and the ratio of luminescence intensity at 617 nm to that at 408 rim (I-617/I-408) enhances linearly with a low detection limit of 0.87 mu M. Additionally, with careful adjustment of lanthanide(III) ions, white-light emission material could be achieved with metal content of Dy0.87Eu0.13.
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