TY - JOUR
T1 - Self-assembled monolayers of NH2-terminated thiolates
T2 - Order, pKa, and specific adsorption
AU - Marmisollé, Waldemar A.
AU - Capdevila, Daiana A.
AU - De La Llave, Ezequiel
AU - Williams, Federico J.
AU - Murgida, Daniel H.
PY - 2013/4/30
Y1 - 2013/4/30
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84877058672&partnerID=8YFLogxK
U2 - 10.1021/la304730q
DO - 10.1021/la304730q
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 23560885
AN - SCOPUS:84877058672
SN - 0743-7463
VL - 29
SP - 5351
EP - 5359
JO - Langmuir
JF - Langmuir
IS - 17
ER -