Detail of "33065-54-2"

Reference

Effects of w-Functional Groups on pH-Dependent Reductive Desorption of Alkanethiol Self-Assembled Monolayers

Effects of w-Functional Groups on pH-Dependent Reductive Desorption of Alkanethiol Self-Assembled Monolayers. Munakata, Hirokazu; Oyamatsu, Daisuke; Kuwabata, Susumu ( Department of Materials Chemistry, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan). Langmuir, 20(23), 10123-10128 (English) 2004 American Chemical Society. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Self-assembled monolayers (SAMs) of alkanethiols having various terminal groups on their w-positions were formed on a Au(111) electrode, and their reductive desorption was studied by linear sweep voltammetry, focusing on effects of soln. pH on the desorption behavior. The peak potentials (Ep) of cathodic waves representing reductive desorption were found to be reflected by the pKa value of the thiol group and were neg. shifted with an increase in pH of the electrolyte soln. The magnitude of the pH dependency of Ep was greatly influenced by the hydrophobicity of the terminal groups. In the cases of alkanethiol SAMs having pH-sensitive terminal groups such as carboxyl and amino groups, their basicity was estd. from bending points appearing in the pH titrn. profile of Ep. 33065-54-2 and 60-23-1 are also in the experiment. This method allows direct detn. of not only the pKa value of the arrayed groups but also that of the groups dissolved in soln. simultaneously. The pKa values of the arrayed carboxyl groups in SAMs were larger by ca. 3 pH units than their original ones, while those for amino groups were smaller by ca. 2 pH units. .