Bottom up approaches for amino β-CD adsorption on gold surfaces. A comparative study

GARCÍA, MARYCARMEN; BOLLO, SOLEDAD; RIVAS, GUSTAVO A.; FERREYRA, NANCY F.; YÁÑEZ, CLAUDIA

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2016 vol. 203 p. 292 - 292

0013-4686

he immobilization of three amino-β-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 β-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 β-CD. A higher coverage via direct adsorption is obtained using the 7-amino groups derivative, while the hi