Issue 23, 2020

Air stable and efficient rare earth Eu(ii) hydro-tris(pyrazolyl)borate complexes with tunable emission colors

Abstract

Luminescent rare earth Eu(II) complexes with a characteristic 5d–4f transition have shown 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)borate)europium(II) (Eu(TpPh,Me)2), bis(hydro-tris(3-phenylpyrazolyl)borate)europium(II) (Eu(TpPh)2), and bis(hydro-tris(3,5-diphenylpyrazolyl)borate)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 the 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 ligand field. This work provides rules for regulating the luminescence properties of Eu(II) complexes as well as design basis for achieving stable and efficient Eu(II) complexes.

Graphical abstract: Air stable and efficient rare earth Eu(ii) hydro-tris(pyrazolyl)borate complexes with tunable emission colors

Supplementary files

Article information

Article type
Research Article
Submitted
27 Jun 2020
Accepted
30 Sep 2020
First published
05 Okt 2020

Inorg. Chem. Front., 2020,7, 4593-4599

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

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, 7, 4593 DOI: 10.1039/D0QI00762E

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