Developing Luminescent Ratiometric Thermometers Based on a Covalent Organic Framework (COF). Issue 5 (3rd January 2020)

• Record Type: Journal Article
• Authors: Kaczmarek, Anna M.; Liu, Ying‐Ya; Kaczmarek, Mariusz K.; Liu, Hengshuo; Artizzu, Flavia; Carlos, Luís D.; Van Der Voort, Pascal
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 5(2020)
• Page Start: 1932
• Page End: 1940
• Publication Date: 2020-01-03
• Subjects: Covalent Organic Frameworks -- Lanthanides -- Quenching -- Ratiometric Thermometers -- Sensors; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201913983
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : A hot candidate : Covalent organic frameworks (COFs) are reported to be an excellent support for the grafting of lanthanide ions/complexes and allow the development of novel types of luminescent thermometers. A unique behavior, that is, no thermal quenching of the Tb 3+ emission, is observed in these LnCOF materials.