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- Title
Ultrasound-Assisted Synthesis of Luminescent Micro- and Nanocrystalline Eu-Based MOFs as Luminescent Probes for Heavy Metal Ions.
- Authors
Kolesnik, Stefaniia S.; Nosov, Viktor G.; Kolesnikov, Ilya E.; Khairullina, Evgenia M.; Tumkin, Ilya I.; Vidyakina, Aleksandra A.; Sysoeva, Alevtina A.; Ryazantsev, Mikhail N.; Panov, Maxim S.; Khripun, Vasiliy D.; Bogachev, Nikita A.; Skripkin, Mikhail Yu.; Mereshchenko, Andrey S.
- Abstract
The luminescent coarse-, micro- and nanocrystalline europium(III) terephthalate tetrahydrate (Eu2bdc3·4H2O) metal-organic frameworks were synthesized by the ultrasound-assisted wet-chemical method. Electron micrographs show that the europium(III) terephthalate microparticles are 7 μm long leaf-like plates. According to the dynamic light scattering technique, the average size of the Eu2bdc3·4H2O nanoparticles is equal to about 8 ± 2 nm. Thereby, the reported Eu2bdc3·4H2O nanoparticles are the smallest nanosized rare-earth-based MOF crystals, to the best of our knowledge. The synthesized materials demonstrate red emission due to the 5D0–7FJ transitions of Eu3+ upon 250 nm excitation into 1ππ* state of the terephthalate ion. Size reduction results in broadened emission bands, an increase in the non-radiative rate constants and a decrease in both the quantum efficiency of the 5D0 level and Eu3+ and the luminescence quantum yields. Cu2+, Cr3+, and Fe3+ ions efficiently and selectively quench the luminescence of nanocrystalline europium(III) terephthalate, which makes it a prospective material for luminescent probes to monitor these ions in waste and drinking water.
- Subjects
LUMINESCENT probes; HEAVY metals; METAL ions; QUANTUM efficiency; LUMINESCENCE quenching; RARE earth metals
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 9, p2448
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11092448