Structure dependence of the surface pKa of mercaptoundecanoic acid SAM on gold

Citation
K. Sugihara et al., Structure dependence of the surface pKa of mercaptoundecanoic acid SAM on gold, ELECTROCH, 67(12), 1999, pp. 1172-1174
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
ELECTROCHEMISTRY
ISSN journal
1344-3542 → ACNP
Volume
67
Issue
12
Year of publication
1999
Pages
1172 - 1174
Database
ISI
SICI code
1344-3542(199912)67:12<1172:SDOTSP>2.0.ZU;2-5
Abstract
The surface pKa of mercaptoundecanoic acid (MUA) in its self-assembled mono layer (SAM) and in mixed monolayers with alkanethiol has been examined usin g the surface mass titration method based on a quartz crystal microbalance. The pKa value, determined from the pH at half the total mass change, shift ed in a positive direction with the increase in the surface coverage of MUA in both monolayers, showing the repulsive interaction between carboxylates . The pKa at zero coverage depends on the monolayer structure; 4.8 for the SAM and 5.6 for the mixed monolayer.