title: Redox-Controlled Ion-Pairing Association of Anionic Surfactant to Ferrocene-Terminated Self-Assembled Monolayers.
abstract: The redox-induced pairing from aqueous solution of a homologous series of sodium n-alkyl sulfate (NaCnSO4) surfactants of 6, 8, 10, and 12 carbons with gold-tethered self-assembled monolayers (SAMs) of ferrocenyldodecanethiolate (FcC12SAu) is investigated by cyclic voltammetry combined with surface plasmon resonance (SPR) spectroscopy. The adsorbed layer thicknesses and surface coverages are consistent with the formation of a monolayer of CnSO4(-) at the oxidized FcC12SAu SAM/aqueous solution interface. A comparison of the anodic charge density with the SPR data indicates that approximately 60% of the adsorbed surfactant anions are paired with SAM-bound ferroceniums, suggesting an interdigitated layer structure. The ion-pairing capabilities of the longer-chain NaC12SO4, NaC10SO4, and NaC8SO4 relative to the short-chain NaC6SO4 are compared using the relative ion-pair formation constants calculated from the apparent SAM redox potentials and IC50 values obtained from competitive association experiments. A longer alkyl chain increases the overall hydrophobicity of the CnSO4(-) anion, thereby increasing its ability to pair with and stabilize the ferrocenium in the nonpolar environment of the SAM. Binary mixtures of NaC12SO4 and NaC6SO4 of different compositions are used to demonstrate that the differences in ion-pairing abilities can be exploited to selectively pair and adsorb C12SO4(-).
authors.affiliation: Department of Chemistry, FRQNT Centre for Self-Assembled Chemical Structures and Regroupement québecois sur les matériaux de pointe, Université de Montréal, C.P. 6128 succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada.
authors.forename: Kim-Ly
authors.initials: KL
authors.lastname: Nguyen
authors.affiliation: Department of Chemistry, FRQNT Centre for Self-Assembled Chemical Structures and Regroupement québecois sur les matériaux de pointe, Université de Montréal, C.P. 6128 succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada.
authors.forename: Eric R
authors.initials: ER
authors.lastname: Dionne
authors.affiliation: Department of Chemistry, FRQNT Centre for Self-Assembled Chemical Structures and Regroupement québecois sur les matériaux de pointe, Université de Montréal, C.P. 6128 succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada.
authors.forename: Antonella
authors.initials: A
authors.lastname: Badia