Oxidation of tellurium dyes induced by mercury: More insights on the naked-eye and fluorescent Hg2+ detection

A new fluorescent probe based on Tellurium-Rhodamine (TR) was designed, synthetized and fully characterized by 1H NMR, 13C NMR, 125Te NMR, HRMS, IR and single crystal X-ray diffraction. A mechanism of Hg2+ detection, based on the oxidation of tellurium by Hg2+ was observed and fully understood. The...

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Bibliographic Details
Published in:Dyes and pigments 2019-01, Vol.160, p.208-216
Main Authors: Soares-Paulino, Antônio A., Giroldo, Lilian, Celante, Gizele, Oliveira, Elisabete, Santos, Sérgio M., Mendes, Ricardo F., Almeida Paz, Filipe A., Fioroto, Alexandre M., Oliveira, Pedro V., Serrano, Silvia H.P., Lodeiro, Carlos, Dos Santos, Alcindo A.
Format: Article
Language:English
Subjects:
Fluorescent sensor
Mercury
Naked-eye
Rhodamine
Telluroxide
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Summary:A new fluorescent probe based on Tellurium-Rhodamine (TR) was designed, synthetized and fully characterized by 1H NMR, 13C NMR, 125Te NMR, HRMS, IR and single crystal X-ray diffraction. A mechanism of Hg2+ detection, based on the oxidation of tellurium by Hg2+ was observed and fully understood. The new monomer chemosensor TR shows a high fluorescent quantum yield Φ = 0.41, excellent selectivity and good sensibility towards Hg2+, with a limit of detection of 2.95 μmol/L. [Display omitted] •Monomeric ligand for Teluro-Rhodamine derivative as fast and selective Hg2+ fluorescent probe.•Formation of telluroxide analyzed by TD-DFT, CV-ICP-OES, electrochemistry and HRMS.•Hg2+ is detected by new a mechanism based on the oxidation of tellurium.•Detection in Real Water Samples.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2018.07.055