Ratiometric mixed Eu–Tb metal–organic framework as a new cryogenic luminescent thermometer

Abstract

International audienc

Lanthanide Isophthalate Metal‐Organic Frameworks: Crystal Structure, Thermal Behavior, and White Luminescence

“…Thus, LaMOF gets a blue emission with CIE chromatic coordinates equal to (0.1836, 0.1259) (Figure S19). Compared to the emission of the pure ligand (Figure S5 in reference 23), [28] a small red‐shift is observed for the coordinated ligand, which may result from a slight change in intra‐ and inter‐molecular interactions between ligands [15] …”

“…In this context, we focus our attention on an inexpensive commercially available organic ligand, namely 1,3-benzenedicarboxylic acid, or isophthalic acid, and water as solvent. This common linker is a rigid carboxylate ligand which enables various coordination modes to build MOF network, [27][28][29][30][31] and which gets an appropriate triplet excited-state energy (27900 cm À 1 ). [32] Herein, we report the synthesis of two new isomorphous 3D lanthanide-bearing metal-organic frameworks built up from isophthalate (1,3-BDC), with the chemical composition Ln 1.14 Na 0.57 (BDC) 2 (H 2 O) • 4H 2 O (Ln=La 3 + or Ce 3 + ).…”

Guiding Rules for Selecting a Nanothermometer

“…From the application point of view, these thermometers stand out due to the broad range of temperatures in which they have been demonstrated to perform. Indeed, there are few examples of compositions that present high sensitivities (between 1 %K -1 and 10 %K -1 ) in the cryogenic range, and thus are proposed for applications dealing with them, as might be the case in aerospace industry or regarding superconducting magnets, to cite some [111][112][113].…”

Engineering of Mixed Eu3+/Tb3+ Metal‐Organic Frameworks Luminescent Thermometers with Tunable Sensitivity

“…Recently, we investigated the thermometric properties of an Eu–Tb mixed MOF built upon the bidentate linker 1,3‐benzene‐dicarboxylic acid (1,3‐H 2 bdc, also called isophthalic acid), namely [Tb 0.87 Eu 0.13 (1,3‐bdc) 3 (H 2 O) 2 ], presenting the maximum relative thermal sensitivity in the cryogenic range ( T < 100 K). [ 23 ] The 1,3‐H 2 bdc linker is a bidentate ligand with different geometric effects to connect metal ions into multidimensional structures via numerous coordination modes. Consequently, several MOFs based on this ligand have been already reported with different structuration, despite their thermometric performance has not always been studied.…”