Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour

The conditions under which alizarin, purpurin, carminc acid, quinalizarin and alizarin red S in the solution ofseveral organic solvents can be electrochemically transformed are analysed. The electrochemical activity ofthese molecules with quinone and phenolic moieties is relatively easy detected by...

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Autores principales: Caram, José Alberto, Banera, Mauro Jonathan, Martínez Suárez, Jaime Fernando, Mirífico, María Virginia
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Ingeniería Química
Alizarin
Uv-Vis
Supporting electrolyte effect
Solvent effect
Electrode reaction mechanism
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/99296
https://ri.conicet.gov.ar/11336/62684
http://linkinghub.elsevier.com/retrieve/pii/S0013468617315578
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-99296
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Química
Alizarin
Uv-Vis
Supporting electrolyte effect
Solvent effect
Electrode reaction mechanism
spellingShingle Ingeniería Química
Alizarin
Uv-Vis
Supporting electrolyte effect
Solvent effect
Electrode reaction mechanism
Caram, José Alberto
Banera, Mauro Jonathan
Martínez Suárez, Jaime Fernando
Mirífico, María Virginia
Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
topic_facet Ingeniería Química
Alizarin
Uv-Vis
Supporting electrolyte effect
Solvent effect
Electrode reaction mechanism
description The conditions under which alizarin, purpurin, carminc acid, quinalizarin and alizarin red S in the solution ofseveral organic solvents can be electrochemically transformed are analysed. The electrochemical activity ofthese molecules with quinone and phenolic moieties is relatively easy detected by cyclic voltammetry. Numerouselectro-reduction/oxidation processes without and with added acid or base are observed. The number,the current intensity and the peak potential of the charge transfer processes are rationalized on the basis of thehomogeneous dissociation equilibriums of the phenolic-OH groups. These equilibria are significantly alteredby the medium. A supporting electrolyte unexpected and important effect on the electrochemical behaviour isobserved. Alkaline cation of the supporting electrolyte promotes the changes in the electrochemical behaviourby coordinating with opposite charge species. A confusion published in the literature that the electro-reductionof the hydroxyquinones proceeds only through the formation of a radical-anion and a dianion is revealed.Solvent effect is explained by the stabilization of charge species, which is related to some solvent properties(Gutmann acceptor/donor number and dielectric constant). Solvents with strong acceptor properties favour thedissociation of the phenolic-OH groups. The dissociation equilibriums of phenolic-OH groups in each solventare confirmed by UV-vis spectra of each dye in solution. Alizarin in DMA solvent with added base shows aparticular electrochemical behaviour.For alizarin/DMF system a reaction mechanism is proposed, and alternative mechanisms are suggested forother dyes.
format Articulo
Preprint
author Caram, José Alberto
Banera, Mauro Jonathan
Martínez Suárez, Jaime Fernando
Mirífico, María Virginia
author_facet Caram, José Alberto
Banera, Mauro Jonathan
Martínez Suárez, Jaime Fernando
Mirífico, María Virginia
author_sort Caram, José Alberto
title Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
title_short Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
title_full Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
title_fullStr Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
title_full_unstemmed Electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part I. medium effect on the electrochemical behaviour
title_sort electrochemical behaviour of anthraquinone dyes in non aqueous solvent solution: part i. medium effect on the electrochemical behaviour
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/99296
https://ri.conicet.gov.ar/11336/62684
http://linkinghub.elsevier.com/retrieve/pii/S0013468617315578
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bdutipo_str Repositorios
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