New luminescent pH-responsive europium complex for multimodal sensing in extremely wide pH range

The new water-soluble europium complex, {(4,7-dichloro-1,10-phenanthroline-2,9-diyl)bis[carbonylnitrilodi(methylene)]}-tetrakis(phosphonato) europium (III), was synthesized and characterized in details spectroscopically. The complex emits narrow lines in the red region of the spectrum when irradiate...

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Bibliographic Details
Published in:Journal of luminescence 2022-03, Vol.243, p.118678, Article 118678
Main Authors: Kharcheva, Anastasiia V., Charyshnikova, Zinaida A., Borisova, Nataliya E., Sumyanova, Tsagana B., Farat, Oleg K., Kharitonov, Dmitriy A., Patsaeva, Svetlana V.
Format: Article
Language:English
Subjects:
Absorbance
Europium complex
Luminescence
Luminescence lifetime
Luminescence quantum yield
Luminescent probe
pH-sensor
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Summary:The new water-soluble europium complex, {(4,7-dichloro-1,10-phenanthroline-2,9-diyl)bis[carbonylnitrilodi(methylene)]}-tetrakis(phosphonato) europium (III), was synthesized and characterized in details spectroscopically. The complex emits narrow lines in the red region of the spectrum when irradiated with the UV radiation. Various luminescence characteristics of this complex dissolved in light and heavy water, as well as in the solid form at room temperature and at the temperature of liquid nitrogen, have been determined. Each independent luminescent characteristic showed individual behavior on pH alteration in aqueous solutions. Below pH = 2.5, we found sharp changes in the luminescence quantum yield and the area ratio for the Gaussian components within the band 5D0→7F4. The changes in the asymmetry coefficient, luminescence lifetime and the Gaussian components area ratio (reversed trend compared to pH 
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2021.118678