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Developing Luminescent Ratiometric Thermometers Based on a Covalent Organic Framework (COF)
Author(s) -
Kaczmarek Anna M.,
Liu YingYa,
Kaczmarek Mariusz K.,
Liu Hengshuo,
Artizzu Flavia,
Carlos Luís D.,
Van Der Voort Pascal
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913983
Subject(s) - luminescence , acetylacetone , lanthanide , thermometer , covalent bond , materials science , metal organic framework , covalent organic framework , ligand (biochemistry) , quenching (fluorescence) , ion , photochemistry , chemistry , inorganic chemistry , fluorescence , organic chemistry , optoelectronics , biochemistry , physics , adsorption , quantum mechanics , receptor
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. 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 δ 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 Tb 3+ 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.