Abstract
Covalent Organic Frameworks (COFs), an emerging class of crystalline porous materials, are proposed as a new type of support for grafting lanthanide ions (Ln3+) and employing these hybrid materials as ratiometric luminescent thermometers. A TpBpy-COF—prepared from 1,3,5-triformylphloroglucinol (Tp) and 2,2′-bipyridine-5,5′-diamine (Bpy) grafted with Eu/Tb and Dy acetylacetone (acac) complexes can be successfully used as a luminescent thermometer in the 10–360 K (Eu) and 280–440 K (Tb) ranges with good sensing properties (thermal sensitivity up to 1.403 % K−1, temperature uncertainty δT<1 K above 110 K). For the Eu/Tb systems, we observe an unusual and rarely reported behavior, that is, no thermal quenching of the Tb3+ emission, a result of the absence of ion-to-ligand/host energy back-transfer. The LnCOF materials proposed here could be a new class of materials employed for temperature-sensing applications following up on the well-known luminescent metal–organic framework thermometers.
Original language | English |
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Pages (from-to) | 1932-1940 |
Number of pages | 9 |
Journal | Angewandte Chemie - International Edition |
Volume | 59 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2020 |
Keywords
- Covalent Organic Frameworks
- Lanthanides
- Quenching
- Ratiometric Thermometers
- Sensors