Abstract
The self-assembly properties of N-[(cholesteryloxy)carbonyl]-N′-ethylviologen (12+) and N-ethyl-N′-octadecylviologen (22+) at the electrode surface were compared on Au in order to assess the effects of the two different hydrophobic tails. Voltammetric data indicated that both compounds self-assemble from aqueous solution forming compact monolayers with the following saturation surface coverages: 3.7 × 10-10 mol/cm2 for 12+ and 4.2 × 10-10 mol/cm2 for 22+. The formal potential for viologen reduction is more positive in 12+ monolayers (-0.345 V vs SSCE) than in 22+ monolayers (-0.458 V vs SSCE). The voltammetric reduction wave for interfacial 12+ is much broader than that for reduction of 22+. However, the monolayers of the cholesteryl derivative seem to be less organized than those made from the octadecyl analog, as judged from the blocking properties of the two monolayers for the reduction of the water-soluble complex Ru-(NH3)63+. These results suggest that the cholesteryl-based monolayers are less organized due to the difficulties associated with the packing of the rigid and sterically bulky cholesteryl subunits.
| Original language | English |
|---|---|
| Pages (from-to) | 591-596 |
| Number of pages | 6 |
| Journal | Langmuir |
| Volume | 9 |
| Issue number | 2 |
| State | Published - Dec 1 1993 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Surfactant monolayers on electrode surfaces : Self-assembly of a viologen derivative having a cholesteryl hydrophobic residue. / Li, Jing; Kaifer, Angel.
In: Langmuir, Vol. 9, No. 2, 01.12.1993, p. 591-596.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Surfactant monolayers on electrode surfaces
T2 - Self-assembly of a viologen derivative having a cholesteryl hydrophobic residue
AU - Li, Jing
AU - Kaifer, Angel
PY - 1993/12/1
Y1 - 1993/12/1
N2 - The self-assembly properties of N-[(cholesteryloxy)carbonyl]-N′-ethylviologen (12+) and N-ethyl-N′-octadecylviologen (22+) at the electrode surface were compared on Au in order to assess the effects of the two different hydrophobic tails. Voltammetric data indicated that both compounds self-assemble from aqueous solution forming compact monolayers with the following saturation surface coverages: 3.7 × 10-10 mol/cm2 for 12+ and 4.2 × 10-10 mol/cm2 for 22+. The formal potential for viologen reduction is more positive in 12+ monolayers (-0.345 V vs SSCE) than in 22+ monolayers (-0.458 V vs SSCE). The voltammetric reduction wave for interfacial 12+ is much broader than that for reduction of 22+. However, the monolayers of the cholesteryl derivative seem to be less organized than those made from the octadecyl analog, as judged from the blocking properties of the two monolayers for the reduction of the water-soluble complex Ru-(NH3)63+. These results suggest that the cholesteryl-based monolayers are less organized due to the difficulties associated with the packing of the rigid and sterically bulky cholesteryl subunits.
AB - The self-assembly properties of N-[(cholesteryloxy)carbonyl]-N′-ethylviologen (12+) and N-ethyl-N′-octadecylviologen (22+) at the electrode surface were compared on Au in order to assess the effects of the two different hydrophobic tails. Voltammetric data indicated that both compounds self-assemble from aqueous solution forming compact monolayers with the following saturation surface coverages: 3.7 × 10-10 mol/cm2 for 12+ and 4.2 × 10-10 mol/cm2 for 22+. The formal potential for viologen reduction is more positive in 12+ monolayers (-0.345 V vs SSCE) than in 22+ monolayers (-0.458 V vs SSCE). The voltammetric reduction wave for interfacial 12+ is much broader than that for reduction of 22+. However, the monolayers of the cholesteryl derivative seem to be less organized than those made from the octadecyl analog, as judged from the blocking properties of the two monolayers for the reduction of the water-soluble complex Ru-(NH3)63+. These results suggest that the cholesteryl-based monolayers are less organized due to the difficulties associated with the packing of the rigid and sterically bulky cholesteryl subunits.
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M3 - Article
AN - SCOPUS:0001087492
VL - 9
SP - 591
EP - 596
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 2
ER -