A lanthanide complex for selective sensing of Fe(III) ions

2nd International Conference on Current Progress in Functional Materials 2017

Zulys, A.^1 ; Amanda, P.^1

Department of Chemistry, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Depok

16424, Indonesia^1

关键词: Fluorescent chemosensors;    Fourier transform infrared;    Lanthanide complex;    Luminescence properties;    Photoinduced energy transfer;    Photophysical properties;    Selective fluorescence;    UV visible absorption spectrum;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/496/1/012009/pdf
DOI  :  10.1088/1757-899X/496/1/012009

来源: IOP

【 摘 要 】

The lanthanide complex [Eu(Tpy-NH2)2Cl2]Cl (1), where Tpy-NH2 is 4-(paminophenyl)-2,2:6,2"-terpyridine, was synthesized. Its photophysical properties, e.g., Fourier Transform Infrared (FTIR) spectra, UV-visible absorption spectra, and luminescence properties, in the presence of various metal ions were studied. Tpy-NH2 acts as chromophore, or light-harvesting photo sensitizing antenna moiety, for Eu3+ luminescence. The bright luminescence in 1 suggests that favourable photo-induced energy transfer occurs from the Tpy-NH2 antenna to the Eu3+ to fill the long-lived emissive excited states of Eu3+ f-f transitions. The luminescence spectral profile of complex 1 showed a characteristic sharp emission band maximum for 5D0 →7F2 f-f transitions at 614 nm originating from Eu3+ ions. The luminescence studies revealed that this material possesses a highly selective fluorescence quenching response to Fe3+ ions in liquid suspension. The dose-dependent fluorescent quenching showed good linearity, and a Fe3+ detection limit of 0.655 μM was calculated for complex 1. This material can potentially be used as a fluorosensor for sensing Fe3+ ions; its luminescence quenching response can be explained in terms of a competitive absorption mechanism.