Bottom up approaches for amino beta-CD adsorption on gold surfaces. A comparative study
Author
dc.contributor.author
García, Marycarmen
Author
dc.contributor.author
Bollo Dragnic, Soledad
Author
dc.contributor.author
Rivas, Gustavo A.
Author
dc.contributor.author
Ferreyra, Nancy F.
Author
dc.contributor.author
Yáñez, Claudia
Admission date
dc.date.accessioned
2016-10-26T19:20:35Z
Available date
dc.date.available
2016-10-26T19:20:35Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Electrochimica Acta 203 (2016) 292–300
es_ES
Identifier
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10.1016/j.electacta.2016.04.030
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/141007
Abstract
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The immobilization of three amino-beta-cyclodextrin derivatives on gold surfaces via different bottom-up approaches was evaluated using cyclic voltammetry and surface plasmon resonance. Direct adsorption on gold and covalent attachment via amide bond formation with carboxylic groups of both the self assembled monolayer of 4-mercapto benzoic acid (4 -MBA) and the electrografted diazonium salt synthesized in situ from 4 -amino benzoic acid (4-ABA) were tested. Amino beta-CD with 1, 2 or 7 amine groups on the primary rim were used. The influence of the immobilization methodologies on the electrochemical properties of the resulting surfaces was studied using hydroquinone and ferricyanide as redox probes. The results indicate that the surface coverage of the molecules as well as their organization at the gold substrate depends on the number of amine groups on the primary rim of 13 -CD. A higher coverage via direct adsorption is obtained using the 7 -amino groups derivative, while the highest coverage is reached with the 2 -amino groups derivative via covalent attachment at diazonium salt electrografted surfaces. A critical discussion about the influence of different strategies used for the immobilization and the number of terminal amine groups on the 13 -CD structure is performed.
es_ES
Patrocinador
dc.description.sponsorship
FONDECYT (Chile)
1151329
CONICET
SECyT-UNC
Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCYT) (Argentina)
Argentina-Chile International Collaboration Grant CONICYT/MINCYT
PCCI130050
CH/13/03