Tailoring the triplet level of isomorphic Eu/Tb mixed MOFs for sensitive temperature sensing

Abstract

Three different thermo-responsive fluorescent thermometers were constructed by regulating the triplet energy level of organic ligands in isostructural Eu/Tb mixed MOFs. Among them, a quite unusual and rarely reported temperature-dependent...

Modulating fluorescence sensing properties of excited-state intramolecular proton transfer (ESIPT)-based metal organic frameworks (MOFs) by metal polarization

“…25 In contrast, there are few studies on the regulation of LMOF fluorescence performance by manipulating the characteristics of metal centers. 26 In fact, electronic structures and polarization of metal ions could affect the charge transfer process between metal centers and ligands, which further plays an important role in detection sensitivity. In particular, the influence of factors such as open metal sites 27 and pore size exclusion effects 28 on different structures is excluded.…”

Our journey of developing dual‐emitting metal‐organic framework‐based fluorescent sensors

“…Our research focuses on improving the sensitivity and extending the response range of the luminescent thermometers. In order to systematically unveil the influence of triplet energy level (T 1 ) of ligands on the performance of Ln−MOF thermometers, while avoiding the influence of the energy transfer distance between the donor and acceptor, three totally isomorphic Eu 3+ /Tb 3+ mixed MOFs Eu 0.01 Tb 0.99 BDC−OH, Eu 0.01 Tb 0.99 BDC‐NH 2 and Eu 0.01 Tb 0.99 NDC (H 2 BDC−OH=2‐hydroxyterephthalic acid, H 2 BDC−NH 2 =2‐aminoterephthalic acid, H 2 NDC=1,4‐naphthalenedicarboxylic acid) were constructed based on a reticular chemistry synthetic strategy from homothetic ligands with different T 1 (Figure 3a) [27] . The experimentally measured T 1 from the time‐resolved spectrum of Gd−MOFs of H 2 BDC−OH, H 2 BDC−NH 2 and H 2 NDC are 24155, 21277, and 20161 cm −1 , which is enough higher, slight higher or lower than the emitting level 5 D 4 of Tb 3+ (20430 cm −1 ), respectively.…”

One‐pot synthesis of ICG&Cur@ZIF‐8 nanocomposites with pH‐controlled drug delivery and good photothermal performance

“…Especially, MOFs have been employed as drug carriers for biomedical application. [25][26][27][28][29] Among these MOFs, an attractive nanocarrier zeolitic imidazolate framework (ZIF-8) [30] has been regarded as a potential candidate for molecule delivery due to the easy preparation, low-cytotoxicity and especially pH-responsibility. However, co-delivery of two therapeutic agents by ZIF-8 with improved therapeutic efficiency has not been studied extensively.…”

“…MOFs, [7–19] composed of metals and organic ligands, have exhibited great potential in gas separation, [20,21] sensing, [22,23] and catalysis [24] due to the high surface area, tunable pore size and easy functionalization. Especially, MOFs have been employed as drug carriers for biomedical application [25–29] . Among these MOFs, an attractive nanocarrier zeolitic imidazolate framework (ZIF‐8) [30] has been regarded as a potential candidate for molecule delivery due to the easy preparation, low‐cytotoxicity and especially pH‐responsibility.…”