Département de chimie moléculaire

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-(CH2)11-EG6-N3 and HS-(CH2)11-EG4-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 deriv. 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 electrochem. controlled desorption of CHI-Fc and PAH-Fc on SAM-$\beta$-CD. Using QCM-D coupled to cyclic voltammetry, 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. Also all specifically attached polymer chains can be detached from the SAM-$\beta$-CD-coated gold surface by applying an elec. field. [on SciFinder(R)]