Back to Search
Start Over
Luminescence modulation via cation–π interaction in a lanthanide assembly: implications for potassium detection.
- Source :
- Journal of Materials Chemistry C; 2/28/2018, Vol. 6 Issue 8, p1944-1950, 7p
- Publication Year :
- 2018
-
Abstract
- Herein luminescent lanthanide supramolecular assemblies were constructed via coordination of a crown-connected bis-terpyridine (L<subscript>1</subscript>) and Ln<superscript>3+</superscript> ions, which can self-assemble to form homogeneous spherical nanoparticles with an average diameter of 700 nm on a silicon plate surface upon slow evaporation of solvents. Potassium ions are shown to give rise to obvious enhancement in the luminescence of Ln<superscript>3+</superscript> (Ln = Eu, Tb) ions in the lanthanide assemblies. The changes are the consequence of the capture of the cations by the crown moieties via cation–π interactions, increasing the triplet excited energy level of L<subscript>1</subscript> and thus favoring the population of the lanthanide's excited state from the antenna triplet state by means of an energy transfer. Besides, energy transfer from Tb<superscript>3+</superscript> to Eu<superscript>3+</superscript> was observed in the luminescent Eu<superscript>3+</superscript>/Tb<superscript>3+</superscript> bimetallic assemblies (Eu/Tb·L<subscript>1</subscript>) and the efficiency can be tuned by potassium concentration. Thus, Eu/Tb·L<subscript>1</subscript> can serve as a self-calibrating sensor, which can selectively and quantitatively detect potassium by linearly correlating the K<superscript>+</superscript> concentration to the emission intensity ratio of <superscript>5</superscript>D<subscript>4</subscript>→<superscript>7</superscript>F<subscript>5</subscript> transition (Tb<superscript>3+</superscript>) to <superscript>5</superscript>D<subscript>0</subscript>→<superscript>7</superscript>F<subscript>2</subscript> transition (Eu<superscript>3+</superscript>). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 6
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 128158098
- Full Text :
- https://doi.org/10.1039/c7tc04580h