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Lanthanide Luminescence Supramolecular Switch Based on Photoreactive Ammonium Molybdate
Ying Wu1, Lei Chen1, Yong Chen1
1College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China.
ACS Applied Materials & Interfaces
|December 6, 2021
Summary
Researchers developed a lanthanide luminescence supramolecular switch using cyclodextrin and polyoxometalates. This switch
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Photochemistry
Background:
- Lanthanide supramolecular assemblies are valuable for cellular imaging and light-emitting materials.
- Controlling lanthanide luminescence via metal ion redox reactions remains a challenge.
- Polyoxometalates offer unique redox and photophysical properties.
Purpose of the Study:
- To construct a novel lanthanide luminescence supramolecular switch.
- To investigate the regulation of lanthanide luminescence by redox-active polyoxometalates.
- To explore applications in anticounterfeiting technologies.
Main Methods:
- Assembly of binary and ternary supramolecular structures using mono-(6-ethylenediamine-6-deoxy)-β-cyclodextrin (ECD) and ammonium molybdate (Mo7).
- Incorporation of lanthanide-containing polyoxometalates (X-POM, X = Eu, Dy).
- Comprehensive characterization using UV-vis, fluorescence, NMR, FTIR, DLS, SEM, and ζ potential measurements.
Main Results:
- Efficient photoreduction of Mo7 (VI) to Mo7 (V) facilitated by the supramolecular assembly's oxygen-shielding effect.
- Fluorescence quenching of X-POM observed during photoreduction due to Förster resonance energy transfer (FRET) with Mo7 (V).
- Reversible fluorescence recovery upon heating, promoting Mo7 (V) oxidation.
- Enhanced and tunable lanthanide luminescence, emitting strong red light (5D0-7F4), suitable for 2D code anticounterfeiting.
Conclusions:
- A new strategy for creating lanthanide luminescence switches controlled by photoreactive polyoxometalates has been developed.
- The ECD-mediated ternary assemblies enhance lanthanide luminescence and enable redox-triggered switching.
- The developed system shows promise for advanced anticounterfeiting applications.
Keywords:
ammonium molybdatefluorescence switchlanthanide supramolecular assembliessupramolecular hydrogelβ-cyclodextrin derivativesMore Related Videos
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