Anion-Dependent Outstanding Luminescence Enhancement of Eu(D-facam)3 Upon Coexistence With the Tetramethylammonium Cation

Ziying Li; Haruki Minami; Kazuki Nakamura; Norihisa Kobayashi

doi:10.1002/cphc.202100609

Anion-Dependent Outstanding Luminescence Enhancement of Eu(D-facam)₃ Upon Coexistence With the Tetramethylammonium Cation

Chemphyschem. 2021 Dec 13;22(24):2511-2516. doi: 10.1002/cphc.202100609. Epub 2021 Oct 26.

Authors

Ziying Li¹, Haruki Minami¹, Kazuki Nakamura¹, Norihisa Kobayashi¹

Affiliation

¹ Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.

PMID: 34617379
DOI: 10.1002/cphc.202100609

Abstract

The effect of a series of tetramethylammonium salts with different counter anions on the photophysical properties of a chiral Eu(III) complex (Eu(D-facam)₃ ) was investigated. Anion-dependent luminescence of the Eu(III) complex was observed, and particularly in the presence of acetate ions, an outstanding luminescence enhancement (>300 times) and induced circularly polarized luminescence (g_lum =-0.63) were obtained. The energy transfer process was then evaluated using key photophysical parameters, and it was found that the sensitisation efficiency of the Eu(III) complex significantly increased in the presence of tetramethylammonium acetate (TMAOAc). The interactions between Eu(D-facam)₃ and TMAOAc were confirmed by luminescence analysis, circular dichroism spectroscopy, Fourier transform infrared spectroscopy and mass spectral measurements.

Keywords: anion sensing; chiroptical properties; europium complex; luminescence enhancement; tetramethylammonium salt.

Publication types

Research Support, Non-U.S. Gov't

Abstract

Publication types

Grants and funding