Differences in the Self-Assembly of Thiol and Disulfide Derivatives of Viologens on Au.
Abstract
A direct comparison of the self-assembly on Au of thiol and disulfide derivatives of viologens bearing long n-alkyl chains was made in order to ascertain the relative efficiency of monolayer formation for each type of functionality. The structures the two derivatives which were studied can be written as CH3V(2+)(CH2)12SH and CH3V(2+)(CH2)l2S2 for the thiol and disulfide, respectively, where V(2+) represents the viologen (i.e. N,N'-dialkylated-4,4'-bipyridinium) redox group. In contrast to the behavior of n-alkyl thiols and di-n-alkyl disulfides, which adsorb to give very nearly the same surface coverage and interfacial properties, these two viologen derivatives exhibit markedly different saturation surface coverages for the fully formed monolayers of 1.8 x 10(exp -10) mol/ sq cm for the disulfide and 3.1 x 10(exp -10) mol/sq cm for the thiol, as determined from the charge for exhaustive reduction and reoxidation of the viologen redox groups. jg p.3
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 08, 1994
- Accession Number
- ADA301978
Entities
People
- Daniel A. Buttry
- Thomas Schneider
Organizations
- University of Wyoming