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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Soares-Paulino, Antonio A. [1, 2] ; Giroldo, Lilian [1] ; Celante, Gizele [1] ; Lodeiro, Carlos [3, 2] ; Dos Santos, Alcindo A. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Quim, LAQV REQUIMTE, BIOSCOPE Grp, P-2829516 Lisbon - Portugal
[3] Proteomass Sci Soc, Rua Inventores, Madan Pk, P-2829516 Caparica - Portugal
Total Affiliations: 3
Document type: Journal article
Source: DYES AND PIGMENTS; v. 159, p. 121-127, DEC 2018.
Web of Science Citations: 4
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 mu mol/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 epsilon = 4.93) and a strong fluorescence emission with maximum intensity in 582 nm (Phi = 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. (AU)

FAPESP's process: 16/09579-0 - Synthesis of Organic Selenides and Tellurides for Detection and Interception of Endogenous Oxidants
Grantee:Alcindo Aparecido dos Santos
Support type: Regular Research Grants