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Multifunctional Lanthanide‐Based Metal–Organic Frameworks with a Polyheterotopic Ligand: Doped with Ytterbium(III) for Luminescence Enhancement and Selective Dye Adsorption
Author(s) -
Chen Wei,
Fan Ruiqing,
Wang Ping,
Dong Yuwei,
Yang Yulin
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201800754
Subject(s) - lanthanide , europium , luminescence , metal organic framework , ligand (biochemistry) , chemistry , adsorption , molecule , crystallography , materials science , inorganic chemistry , photochemistry , ion , organic chemistry , biochemistry , receptor , optoelectronics
The chemistry of metal–organic frameworks has been progressing fast with its exciting potential in multifunctional applications. A series of three‐dimensional lanthanide‐based metal–organic frameworks, {[Ln(HTPO)(NO 3 )(H 2 O)]⋅ x (CH 3 CN)⋅ y (H 2 O)} n (Ln=Eu ( 1 ), Tb ( 2 ), Gd ( 3 ), Sm ( 4 ), Dy ( 5 ), Nd ( 6 )), {[Eu(TPO)(HCOO) 0.5 ]⋅(H 3 O) 0.5 } n ( 7 ), {[Eu(TPO)(DMF)]⋅(solv) x } n ( 8 ; DMF= N , N ‐dimethylformamide), and {[Eu(TPO)(DMA)]⋅(solv) x } n ( 9 ; DMA=dimethylacetamide) were synthesized with semirigid C 3 ‐symmetric ligand tris(4‐carboxylphenyl)phosphine oxide (H 3 TPO). In these frameworks, the H 3 TPO ligand exists in a totally different configuration. Framework 1 exhibits good breathing properties for absorbing more guest molecules through a solvent‐induced single‐crystal‐to‐single‐crystal (SC–SC) transformation involving a configuration transformation of the organic linker in the framework. The ytterbium ion was doped into 1 to improve the luminescent performance (lifetime and quantum yield) of the red europium emission. Among a series of Eu 1− x Yb x TPO samples, Eu 0.88 Yb 0.12 TPO showed enhanced luminescence intensity (≈5.1 times that of the pure europium system), and the lifetime increased from 1073.08 to 1236.57 μs. Moreover, the porosity of these frameworks allows them to efficiently adsorb dye molecules with high selectivity and efficiency.