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Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water

The complexing properties of two water-soluble resorcin[4]arenes (tetrasodium 5,11,17,23-tetrakissulfonatemethylen 2,8,14,20-tetra(butyl)resorcin[4]arene, Na(4)BRA, and tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcin[4]arene, Na(4)SRA) with polluting hea...

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Autores principales: Sanabria, Edilma, Esteso, Miguel A., Vargas, Edgar F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9415269/
https://www.ncbi.nlm.nih.gov/pubmed/36006140
http://dx.doi.org/10.3390/toxics10080461
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author Sanabria, Edilma
Esteso, Miguel A.
Vargas, Edgar F.
author_facet Sanabria, Edilma
Esteso, Miguel A.
Vargas, Edgar F.
author_sort Sanabria, Edilma
collection PubMed
description The complexing properties of two water-soluble resorcin[4]arenes (tetrasodium 5,11,17,23-tetrakissulfonatemethylen 2,8,14,20-tetra(butyl)resorcin[4]arene, Na(4)BRA, and tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcin[4]arene, Na(4)SRA) with polluting heavy metals such as Cu(2+), Pb(2+), Cd(2+) and Hg(2+) were studied by conductivity, and the findings were confirmed by using other techniques to try to apply this knowledge to removing them. The results indicate that Na(4)BRA is able to complex Cu(2+) in a 1:1 ratio and Pb(2+) in a 1:2 ratio, while Na(4)SRA complexes Hg(2+) in a 1:1 ratio. On the contrary, no indications have been observed that either of the resorcin[4]arenes studied complexes the Cd(2+) ions. The results suggest that the bonds established between the sulfur atoms located at the lower edge of the SRA(4−) and the solvent hydrogens could prevent the entry of the guest into the host cavity. However, in the case of Hg(2+) ions, the entry is favoured by the interactions between the sulfur donor atoms present on the lower edge of Na(4)SRA and the Hg(2+) ions. Therefore, it can be said that Na(4)BRA is selective for Cu(2+) and Pb(2+) ions and Na(4)SRA is selective for Hg(2+) ions.
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spelling pubmed-94152692022-08-27 Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water Sanabria, Edilma Esteso, Miguel A. Vargas, Edgar F. Toxics Article The complexing properties of two water-soluble resorcin[4]arenes (tetrasodium 5,11,17,23-tetrakissulfonatemethylen 2,8,14,20-tetra(butyl)resorcin[4]arene, Na(4)BRA, and tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcin[4]arene, Na(4)SRA) with polluting heavy metals such as Cu(2+), Pb(2+), Cd(2+) and Hg(2+) were studied by conductivity, and the findings were confirmed by using other techniques to try to apply this knowledge to removing them. The results indicate that Na(4)BRA is able to complex Cu(2+) in a 1:1 ratio and Pb(2+) in a 1:2 ratio, while Na(4)SRA complexes Hg(2+) in a 1:1 ratio. On the contrary, no indications have been observed that either of the resorcin[4]arenes studied complexes the Cd(2+) ions. The results suggest that the bonds established between the sulfur atoms located at the lower edge of the SRA(4−) and the solvent hydrogens could prevent the entry of the guest into the host cavity. However, in the case of Hg(2+) ions, the entry is favoured by the interactions between the sulfur donor atoms present on the lower edge of Na(4)SRA and the Hg(2+) ions. Therefore, it can be said that Na(4)BRA is selective for Cu(2+) and Pb(2+) ions and Na(4)SRA is selective for Hg(2+) ions. MDPI 2022-08-09 /pmc/articles/PMC9415269/ /pubmed/36006140 http://dx.doi.org/10.3390/toxics10080461 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sanabria, Edilma
Esteso, Miguel A.
Vargas, Edgar F.
Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title_full Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title_fullStr Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title_full_unstemmed Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title_short Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water
title_sort recognition of heavy metals by using resorcin[4]arenes soluble in water
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9415269/
https://www.ncbi.nlm.nih.gov/pubmed/36006140
http://dx.doi.org/10.3390/toxics10080461
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