Abstract
Two kinds of monolayered films of ion-paired macrocyclic amphiphiles formed from anionic surfactant 1,2-bis[(dodecyloxy)carbonyl]ethane-1-sulfonate and tetracationic macrocycles with different molecular sizes were prepared on hydrophilic silica plates by the Langmuir-Blodgett technique. Vibrational sum-frequency generation (SFG) spectroscopy was applied to investigate the packing structure of the alkyl chains of the films. The SF intensity ratio of the CH symmetric stretching mode of the methylene group to that of methyl group in the alkyl chains increased when the occupied area of the macrocycle was larger than the sum of the cross-sectional areas of the hydrophobic alkyl tails. The appearance of a methylene CH band in the SFG spectra implies the presence of gauche conformation in the alkyl chains. This indicates that the molecular size of the cyclic tetracation hydrophilic head exclusively governs the packing structure of the alkyl group hydrophobic tails in the monolayer state. The results show that monolayer fabrication using ion-paired macrocyclic amphiphiles has advantages in allowing control over the packing structure of the outermost alkyl chains of solid surfaces through the choice of the size of the tetracation.
| Original language | English |
|---|---|
| Pages (from-to) | 3855-3859 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry B |
| Volume | 106 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Apr 18 2002 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
Controlling packing structure of hydrophobic alkyl tails of monolayered films of ion-paired macrocyclic amphiphiles as studied by sum-frequency generation spectroscopy. / Onda, Ken; Nakagawa, Masaru; Asakai, Toshiaki; Watase, Reiko; Wada, Akihide; Ichimura, Kunihiro; Hirose, Chiaki.
In: Journal of Physical Chemistry B, Vol. 106, No. 15, 18.04.2002, p. 3855-3859.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Controlling packing structure of hydrophobic alkyl tails of monolayered films of ion-paired macrocyclic amphiphiles as studied by sum-frequency generation spectroscopy
AU - Onda, Ken
AU - Nakagawa, Masaru
AU - Asakai, Toshiaki
AU - Watase, Reiko
AU - Wada, Akihide
AU - Ichimura, Kunihiro
AU - Hirose, Chiaki
PY - 2002/4/18
Y1 - 2002/4/18
N2 - Two kinds of monolayered films of ion-paired macrocyclic amphiphiles formed from anionic surfactant 1,2-bis[(dodecyloxy)carbonyl]ethane-1-sulfonate and tetracationic macrocycles with different molecular sizes were prepared on hydrophilic silica plates by the Langmuir-Blodgett technique. Vibrational sum-frequency generation (SFG) spectroscopy was applied to investigate the packing structure of the alkyl chains of the films. The SF intensity ratio of the CH symmetric stretching mode of the methylene group to that of methyl group in the alkyl chains increased when the occupied area of the macrocycle was larger than the sum of the cross-sectional areas of the hydrophobic alkyl tails. The appearance of a methylene CH band in the SFG spectra implies the presence of gauche conformation in the alkyl chains. This indicates that the molecular size of the cyclic tetracation hydrophilic head exclusively governs the packing structure of the alkyl group hydrophobic tails in the monolayer state. The results show that monolayer fabrication using ion-paired macrocyclic amphiphiles has advantages in allowing control over the packing structure of the outermost alkyl chains of solid surfaces through the choice of the size of the tetracation.
AB - Two kinds of monolayered films of ion-paired macrocyclic amphiphiles formed from anionic surfactant 1,2-bis[(dodecyloxy)carbonyl]ethane-1-sulfonate and tetracationic macrocycles with different molecular sizes were prepared on hydrophilic silica plates by the Langmuir-Blodgett technique. Vibrational sum-frequency generation (SFG) spectroscopy was applied to investigate the packing structure of the alkyl chains of the films. The SF intensity ratio of the CH symmetric stretching mode of the methylene group to that of methyl group in the alkyl chains increased when the occupied area of the macrocycle was larger than the sum of the cross-sectional areas of the hydrophobic alkyl tails. The appearance of a methylene CH band in the SFG spectra implies the presence of gauche conformation in the alkyl chains. This indicates that the molecular size of the cyclic tetracation hydrophilic head exclusively governs the packing structure of the alkyl group hydrophobic tails in the monolayer state. The results show that monolayer fabrication using ion-paired macrocyclic amphiphiles has advantages in allowing control over the packing structure of the outermost alkyl chains of solid surfaces through the choice of the size of the tetracation.
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U2 - 10.1021/jp013939v
DO - 10.1021/jp013939v
M3 - Article
AN - SCOPUS:0037129474
VL - 106
SP - 3855
EP - 3859
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 15
ER -