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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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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Autor(es):
Soares-Paulino, Antonio A. [1, 2] ; Giroldo, Lilian [1] ; Celante, Gizele [1] ; Lodeiro, Carlos [3, 2] ; Dos Santos, Alcindo A. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: DYES AND PIGMENTS; v. 159, p. 121-127, DEC 2018.
Citações Web of Science: 4
Resumo

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)

Processo FAPESP: 16/09579-0 - Síntese de Selenetos e Teluretos Orgânicos para Detecção e Intercepção de Entidades Oxidantes Endógenas
Beneficiário:Alcindo Aparecido dos Santos
Linha de fomento: Auxílio à Pesquisa - Regular