Artículos de revistas
Self-Assembled Monolayers of NH2‑Terminated Thiolates: Order, pKa, and Specific Adsorption
Fecha
2013-01Registro en:
Marmisollé, Waldemar Alejandro; Capdevila, Daiana Andrea; de la Llave, Ezequiel Pablo; Williams, Federico Jose; Murgida, Daniel Horacio; Self-Assembled Monolayers of NH2‑Terminated Thiolates: Order, pKa, and Specific Adsorption; American Chemical Society; Langmuir; 29; 17; 1-2013; 5351-5359
0743-7463
Autor
Marmisollé, Waldemar Alejandro
Capdevila, Daiana Andrea
de la Llave, Ezequiel Pablo
Williams, Federico Jose
Murgida, Daniel Horacio
Resumen
Self-assembled monolayers (SAMs) of amino-terminated alkanethiols on Au were characterized by a combination of electrochemical (LSV, CV, and EIS) and spectroscopic (XPS and SER) techniques. Clear correlations were obtained between the apparent surface pKa values determined by impedimetric titrations and order parameters such as the content of trans conformers in the SAMs. These results contrast with previous studies that exhibit dispersions of up to 6 pH units in the reported pKa values. In addition, we determined that inorganic and organic phosphate species bind specifically to these SAMs mediating adsorption and heterogeneous electron transfer of positively charged macromolecules such as cytochrome c.