Luminescent Nanothermometers Obtained by Post-Synthetic Modification of Metal-Organic Framework MIL-68


Metal-organic frameworks (MOFs) bearing lanthanide ions are excellent platforms for designing luminescent thermometers. However, so far, post-synthetic modification of MOFs linkers has not been explored as a route to produce such thermometers, despite its potential to design the lanthanide coordination sphere and, thus, tune the emission properties of the material. Here, nanocrystals of MIL-68-NH2 were post-synthetically modified via a cross-linking reaction with 1,4-Bis{4-[(E)-3-(N,N-dimethylamino)prop-2-enoyl]phenoxy}butane (HL), followed by coordination to Eu3+ and Tb3+ ions. The luminescence properties of the material were assessed. Tb90Eu10-MIL-68-HL was found to be an excellent cryogenic (< 100 K) ratiometric luminescent nanothermometer exhibiting a maximum relative sensitivity of 9.4 % K-1 at 12 K.



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Abdelhameed, RM; Ananias, D; Silva, AMS; Rocha, J

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Thanks are due to University of Aveiro and FCT/MEC for the financial support to the QOPNA research project (FCT UID/QUI/00062/2019) and to the CICECO-Aveiro Institute of Materials (POCI-01-0145-FEDER-007679; FCT UID/CTM/50011/2019), financed by national funds and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement, and to the Portuguese NMR Network. We further wish to thank STDF (project number 25313) for the grant given to R. M. Abdelhameed.

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