Fabrication of Ln-MOFs with color-tunable photoluminescence and sensing for small molecules
Three isomorphic lanthanide metal-organic frameworks (Ln-MOFs) [LnL(H{sub 2}O){sub 2}]·2H{sub 2}O (Ln=Tb for 1, Eu for 2, Gd for 3) have been constructed from flexible organic ligand 4-(2-carboxyphenoxy)benzene-1,3-dioic acid (H{sub 3}L). They exhibit two-dimensional (2D) layered structure with the rhombus windows along the b axis. This network can be described as a shubnikov plane net with Schäfli symbol of (4{sup 3}){sub 2}(4{sup 6}.6{sup 6}.8{sup 3}). Solid state luminescent studies indicate that 1 and 2 show the characteristic red, and green emissions of the corresponding Ln{sup 3+} ions, respectively, while 3 exhibits blue emission arising from the organic ligand. Then by adjusting the relative amounts of different luminescent components into the well-defined host framework, a series of new co-doped Ln-MOF, Tb{sub 1−x}Eu{sub x}L (4) (x refers to the molar ratios of Eu{sup 3+} and Tb{sup 3+}), with tunable luminescence have been fabricated. The luminescent color of 4 can be tuned from green to red due to the energy transfer from the Tb{sup 3+} to Eu{sup 3+} ions by changing the doping concentration of the Eu{sup 3+} ions. In addition, 2 exhibits good stability in different solvents and excellent fluorescence sensing for small molecules, especially for CH{sub 3}CN and nitrobenzene. - Graphical abstract: A series of isomorphic 2D layered Ln-MOFs have been constructed from flexible tricarboxylic ligand, showing tunable luminescence and excellent fluorescence sensing for small molecules, respectively. - Highlights: • Three isomorphic 2D layered Ln-MOFs were constructed by flexible tricarboxylic acid. • A series of Eu{sup 3+}/Tb{sup 3+} doped Ln-MOF 4 were fabricated and showed tunable luminescence. • Ln-MOF 2 exhibited excellent fluorescence sensing for small molecules.
- OSTI ID:
- 22658148
- Journal Information:
- Journal of Solid State Chemistry, Vol. 245; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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