Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 8, Issue 22, Pages 4828-4837Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qi01079d
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Funding
- National Natural Science Foundation of China [21971069, 21773070]
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A novel Eu(iii) metal-organic framework with 3-fold interpenetration exhibits multi-responsive behaviors such as photochromism, photoluminescence, and sensing of ammonia and O-2. Charge transfer within the framework and host-guest electron transfer lead to fluorescence quenching, color change, and size-selective response to ammonia and amines.
A novel Eu(iii) metal-organic framework (MOF) featuring 3-fold interpenetration shows multi-responsive behaviors owing to the combination of charge transfer, electron transfer, and energy transfer between different ingredients (the electron-deficient tris(pyridinium)triazine (tpt) chromophore, the electron-rich naphthalene chromophore, the Eu(iii) luminophore, and the guest anion). The interframework naphthalene-to-tpt charge transfer dictated by framework interpenetration serves to sensitize the Eu(iii) emission through energy transfer. The photoinduced host-guest electron transfer from the intrinsic chloride guest to tpt leads to photochromism and photoquenching of photoluminescence. The spontaneous host-guest electron transfer from extrinsic amine/ammonia to tpt allow chromic and luminescent response to ammonia and amines with size selectivity. Furthermore, the photogenerated phase shows sensitive color change and luminescence turn-on upon exposure to O-2. The multi-responsive properties offer the appeal for optical switching and sensing use. The qualitative and quantitative gaseous sensing of ammonia and O-2 has been demonstrated with portable and reusable MOF-polymer membranes.
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