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Luminescence modulation by cation-π interaction in a lanthanide assembly: implications for potassium detection

Abstract

Herein luminescent lanthanide supramolecular assemblies were constructed via coordination of the crown-connected bis-terpyridine (L1) and Ln3+ ions, which can self-assembly to form homogeneous spherical nanoparticles with an average diameter of 700 nm on silicon plate surface upon slow evaporation of solvents. Potassium ions are shown to give rise to obvious enhancement in luminescence of Ln3+ (Ln=Eu, Tb) ions in the lanthanide assemblies. The changes are the consequence of the capture of the cations by the crown moieties through cation-π interactions, increasing the triplet excited energy level of L1 and thus favoring the population of Lanthanide’s excited state from the antenna triplet state by means of an energy transfer. Besides, energy transfer from Tb3+ to Eu3+ was observed in the luminescent Eu3+/Tb3+ bimetallic assemblies (Eu/Tb.L1) and the efficiency can be tuned by potassium concentration. Thus, Eu/Tb.L1 can serve as self-calibrating sensor, which can selectively and quantitatively detect potassium by linearly correlating the K+ concentration to the emission intensity ratio of 5D4→7F5 transition (Tb3+) to 5D0→7F2 transition (Eu3+).

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Publication details

The article was received on 08 Oct 2017, accepted on 29 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04580H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Luminescence modulation by cation-π interaction in a lanthanide assembly: implications for potassium detection

    D. Yang, Y. Wang, D. Liu, Z. Li and H. Li, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04580H

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