Self-assembled monolayers of NH2-terminated thiolates: Order, pKa, and specific adsorption

Waldemar A. Marmisollé, Daiana A. Capdevila, Ezequiel De La Llave, Federico J. Williams, Daniel H. Murgida

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)5351-5359
Number of pages9
JournalLangmuir
Volume29
Issue number17
DOIs
StatePublished - 30 Apr 2013
Externally publishedYes

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