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Air stable and efficient rare earth Eu(II) hydro-tris(pyrazolyl)borates complexes with tunable emission color

Abstract

Luminescent rare earth Eu(II) complexes with characteristic 5d-4f transition show potential in various applications. However, the exploration and further application of typical Eu(II) complexes are strongly impeded by their instability arising from the easily oxidation of Eu2+ ions. In this work, three new Eu(II) complexes bis(hydro-tris(3-phenyl-5-methylpyrazolyl)borates)europium(II) (Eu(TpPh,Me)2), bis(hydro-tris(3-phenylpyrazolyl)borates)europium(II) (Eu(TpPh)2), and bis(hydro-tris(3,5-diphenylpyrazolyl)borates)europium(II) (Eu(TpPh2)2) were designed and synthesized. Their crystal structures, photophysical properties and air stabilities were characterized and discussed. It is found that the introduction of bulky phenyl group not only increases the air stability by sterically hindering the central Eu2+ ions, but also tunes the maximum emission wavelength by influencing the crystal field. This work provide rules for regulating luminescence properties of Eu(II) complexes as well as design basis for achieving stable and efficient Eu(II) complexes.

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Supplementary files

Article information


Submitted
27 Jun 2020
Accepted
30 Sep 2020
First published
05 Oct 2020

Inorg. Chem. Front., 2020, Accepted Manuscript
Article type
Research Article

Air stable and efficient rare earth Eu(II) hydro-tris(pyrazolyl)borates complexes with tunable emission color

H. Qi, Z. Zhao, G. Zhan, B. Sun, W. Yan, C. Wang, L. Wang, Z. Liu, Z. Bian and C. Huang, Inorg. Chem. Front., 2020, Accepted Manuscript , DOI: 10.1039/D0QI00762E

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