Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 5, Pages 1932-1940Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913983
Keywords
Covalent Organic Frameworks; Lanthanides; Quenching; Ratiometric Thermometers; Sensors
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Funding
- Ghent University
- project CICECO-Aveiro Institute of Materials (FCT) [UID/CTM/50011/2019]
- International S&T Cooperation Program of China [2016YFE0109800]
- Fundamental Research Fund for the Central Universities of China [DUT17JC20]
- Research Foundation-Flanders, Belgium (FWO-Vlaanderen) [3G000117]
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Covalent Organic Frameworks (COFs), an emerging class of crystalline porous materials, are proposed as a new type of support for grafting lanthanide ions (Ln(3+)) and employing these hybrid materials as ratiometric luminescent thermometers. ATpBpy-COF-prepared from 1,3,5-triformyl-phloroglucinol (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 delta T < 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.
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