Molecular packing of amphiphiles with crown polar heads at the air-water interface

K. Larson; D. Vaknin; O. Villavicencio; D. McGrath; V. V. Tsukruk

doi:10.1021/jp015579h

Molecular packing of amphiphiles with crown polar heads at the air-water interface

K. Larson, D. Vaknin, O. Villavicencio, D. McGrath, V. V. Tsukruk

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Abstract

An amphiphilic compound containing a benzyl-15-crown-5 focal point, azobenzene spacer, and a dodecyl tail as a peripheral group has been investigated at the air-water interface. X-ray reflectivity and grazing incident diffraction (XGID) were performed on the Langmuir monolayers to elucidate molecular packing and orientation of molecular fragments for the compound with mismatch between cross-sectional areas of hydrophobic and hydrophilic segments. At high surface pressure, we observed intralayer packing of the alkyl tails with doubling parameters of the conventional orthorhombic unit cell (supercell) and long-range positional ordering. High tilt of the alkyl tails of 58° from the surface normal was a signature of molecular packing caused by a large mismatch between the cross-sectional areas of the polar head (45 Å²) and the alkyl tail (20 Å²).

Original language	English (US)
Pages (from-to)	7246-7251
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	106
Issue number	29
DOIs	https://doi.org/10.1021/jp015579h
State	Published - Jul 25 2002

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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abstract = "An amphiphilic compound containing a benzyl-15-crown-5 focal point, azobenzene spacer, and a dodecyl tail as a peripheral group has been investigated at the air-water interface. X-ray reflectivity and grazing incident diffraction (XGID) were performed on the Langmuir monolayers to elucidate molecular packing and orientation of molecular fragments for the compound with mismatch between cross-sectional areas of hydrophobic and hydrophilic segments. At high surface pressure, we observed intralayer packing of the alkyl tails with doubling parameters of the conventional orthorhombic unit cell (supercell) and long-range positional ordering. High tilt of the alkyl tails of 58° from the surface normal was a signature of molecular packing caused by a large mismatch between the cross-sectional areas of the polar head (45 {\AA}2) and the alkyl tail (20 {\AA}2).",

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T1 - Molecular packing of amphiphiles with crown polar heads at the air-water interface

AU - Larson, K.

AU - Vaknin, D.

AU - Villavicencio, O.

AU - McGrath, D.

AU - Tsukruk, V. V.

PY - 2002/7/25

Y1 - 2002/7/25

N2 - An amphiphilic compound containing a benzyl-15-crown-5 focal point, azobenzene spacer, and a dodecyl tail as a peripheral group has been investigated at the air-water interface. X-ray reflectivity and grazing incident diffraction (XGID) were performed on the Langmuir monolayers to elucidate molecular packing and orientation of molecular fragments for the compound with mismatch between cross-sectional areas of hydrophobic and hydrophilic segments. At high surface pressure, we observed intralayer packing of the alkyl tails with doubling parameters of the conventional orthorhombic unit cell (supercell) and long-range positional ordering. High tilt of the alkyl tails of 58° from the surface normal was a signature of molecular packing caused by a large mismatch between the cross-sectional areas of the polar head (45 Å2) and the alkyl tail (20 Å2).

AB - An amphiphilic compound containing a benzyl-15-crown-5 focal point, azobenzene spacer, and a dodecyl tail as a peripheral group has been investigated at the air-water interface. X-ray reflectivity and grazing incident diffraction (XGID) were performed on the Langmuir monolayers to elucidate molecular packing and orientation of molecular fragments for the compound with mismatch between cross-sectional areas of hydrophobic and hydrophilic segments. At high surface pressure, we observed intralayer packing of the alkyl tails with doubling parameters of the conventional orthorhombic unit cell (supercell) and long-range positional ordering. High tilt of the alkyl tails of 58° from the surface normal was a signature of molecular packing caused by a large mismatch between the cross-sectional areas of the polar head (45 Å2) and the alkyl tail (20 Å2).

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Molecular packing of amphiphiles with crown polar heads at the air-water interface

Abstract

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