title: Electrochemically controlled adsorption of Fc-functionalized polymers on beta-CD-modified self-assembled monolayers.
abstract: This work presents an in situ study of the adsorption/desorption behavior of ferrocene(Fc)-functionalized linear polymers on a gold surface covered with beta-cyclodextrin(beta-CD)-modified self-assembled monolayers (SAMs). The characterization of binary SAMs obtained with HS-(CH(2))(11)-EG(6)-N(3) and HS-(CH(2))(11)-EG(4)-OH (EG, ethylene glycol) was performed using a quartz crystal microbalance with dissipation monitoring (QCM-D), cyclic voltammetry, and contact angle measurements. The functionalization of SAMs with beta-CD was made via the "click" reaction between the beta-CD monoalkyne derivative and azide groups exhibited by SAMs. The formation of the host-guest complex between SAM-beta-CD and Fc-derivatized polymers (chitosan (CHI) and poly(allylamine hydrochloride) (PAH)) was studied by QCM-D. The viscoelastic model of Voinova was used to fit QCM-D curves recorded during the adsorption and electrochemically controlled desorption of CHI-Fc and PAH-Fc on SAM-beta-CD. Using QCM-D coupled to cyclic voltammetry, we demonstrated that CHI-Fc and PAH-Fc can be successfully deposited on a SAM-beta-CD-coated gold surface forming a stable multivalent inclusion complex between Fc moieties of polymer and beta-CD cavities of SAM. We also showed that all specifically attached polymer chains can be detached from the SAM-beta-CD-coated gold surface by applying an electric field.
authors.affiliation: Département de Chimie Moléculaire, UMR CNRS-UJF 5250, ICMG FR-2607, Université Joseph Fourier, BP 53, 38041 Grenoble, Cedex 9, France.
authors.forename: Galina V
authors.initials: GV
authors.lastname: Dubacheva
authors.forename: Angéline
authors.initials: A
authors.lastname: Van der Heyden
authors.forename: Pascal
authors.initials: P
authors.lastname: Dumy
authors.forename: Oznur
authors.initials: O
authors.lastname: Kaftan
authors.forename: Rachel
authors.initials: R
authors.lastname: Auzély-Velty
authors.forename: Liliane
authors.initials: L
authors.lastname: Coche-Guerente
authors.forename: Pierre
authors.initials: P
authors.lastname: Labbé
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry; D004563:Electrochemistry; D005296:Ferrous Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D000075163:Metallocenes; D015394:Molecular Structure; D011073:Polyamines / Q000737:chemistry*; D013499:Surface Properties; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D000075163:Metallocenes; D011073:Polyamines; D047392:beta-Cyclodextrins; C063994:polyallylamine; D006046:Gold; D048271:Chitosan; C031215:betadex; C004998:ferrocene