Formation of an emissive telluroxide promoted by Hg2+ in aqueous environment: A new naked-eye and ratiometric rhodamine dimer fluorescent mercury(II) probe

Antônio A. Soares-Paulino, Lilian Giroldo, Gizele Celante, Carlos Lodeiro, Alcindo A. Dos Santos

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A new chemosensor based on tellurium-rhodamine B (TRB) for the fast and selective detection of Hg2+ in aqueous medium was designed and synthetized in only two steps from a symmetrical organic telluride and rhodamine B. The structure of TRB was determined by RMN, HRMS and IR and its photophysical properties were determined in MeCN/H2O 75:25 v/v. TRB is able to detect Hg2+ in solutions diluted until 1.71 μmol/L and containing until 75% of water in it. In the presence of Hg2+, TRB presents an intense pink color with maximum absorption in 558 nm (log ε = 4.93) and a strong fluorescence emission with maximum intensity in 582 nm (Φ = 0.17). The detection of Hg2+ by TRB occurs by the oxidation of the tellurium promoted by Hg2+, where a redox mechanism was proposed. Even the detection of Hg2+ occurring by the oxidation of tellurium, TRB presented a high selectivity for Hg2+, even when several ROS (H2O2, KNO2, NaOCl, NaONOO e KO2) were submitted to the screening.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalDyes and Pigments
Volume159
DOIs
Publication statusPublished - 1 Dec 2018
Event3rd International Caparica Conference on Chromogenic and Emissive Materials - Lisbon, Portugal
Duration: 3 Sep 20186 Sep 2018

Keywords

  • Fluorescent sensor
  • Mercury
  • Nacked-eye&zerowidthspace
  • Tellurium
  • Telluroxide

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