Artículos de revistas
A pH-Sensitive Supramolecular Switch Based on Mixed Carboxylic Acid Terminated Self-Assembled Monolayers on Au(111)
Fecha
2016-02-14Registro en:
Jacquelin, Daniela Karina; Perez, Manuel Alejo; Euti, Esteban; Arisnabarreta, Nicolás; Cometto, Fernando Pablo; et al.; A pH-Sensitive Supramolecular Switch Based on Mixed Carboxylic Acid Terminated Self-Assembled Monolayers on Au(111); American Chemical Society; Langmuir; 32; 4; 14-2-2016; 947-953
0743-7463
1520-5827
CONICET Digital
CONICET
Autor
Jacquelin, Daniela Karina
Perez, Manuel Alejo
Euti, Esteban
Arisnabarreta, Nicolás
Cometto, Fernando Pablo
Paredes Olivera, Patricia
Patrito, Eduardo Martin
Resumen
We show that homogeneously mixed self-assembled monolayers (SAMs) of mercaptoalkanoic acids of different chain lengths can be used to build up a pH-sensitive supramolecular switch. The acids with short and long alkyl chains interact via the strong hydrogen bond between carboxylic acid groups. The pH acts as a trigger by breaking or restoring the hydrogen bond interaction in basic or acidic solutions, respectively. The corresponding changes in the monolayer structure were determined by ellipsometry, surface-enhanced Raman spectroscopy, and contact angle measurements. Density functional theory (DFT) calculations were performed to elucidate the structures of interacting molecules compatible with the surface coverage obtained from electrochemical reductive desorption experiments. The simplicity of the preparation procedure assures a high reproducibility whereas the stability of the homogeneous mixed SAM guarantees the reversibility of the switching process.