A fourier transform infrared study of bilayer membranes of double-chain ammonium amphiphiles

Naotoshi Nakashima; Norihiro Yamada; Toyoki Kunitake; Junzo Umemura; Tohru Takenaka

doi:10.1021/j100406a014

A fourier transform infrared study of bilayer membranes of double-chain ammonium amphiphiles

Naotoshi Nakashima, Norihiro Yamada, Toyoki Kunitake, Junzo Umemura, Tohru Takenaka

Institute for Advanced Study

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Abstract

Fourier transform infrared spectroscopy was applied to an examination of the phase transition behavior of aqueous bilayer membranes of double-chain ammonium amphiphiles. Large spectral changes were observed at the respective gel-to-liquid crystal phase transitions (T_c) of the bilayers. The frequency change in the antisymmetric CH₂ stretching band indicated formation of the gauche conformation at T_c. The ester groups became either hydrated or disordered in the liquid crystalline state, but the amide units remained strongly associated. It is concluded that intermolecular hydrogen bonding is not necessarily weakened at T_c, although the molecular packing is loosened.

Original language	English
Pages (from-to)	3374-3377
Number of pages	4
Journal	Journal of Physical Chemistry
Volume	90
Issue number	15
DOIs	https://doi.org/10.1021/j100406a014
Publication status	Published - Jan 1 1986

All Science Journal Classification (ASJC) codes

Engineering(all)
Physical and Theoretical Chemistry

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10.1021/j100406a014

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abstract = "Fourier transform infrared spectroscopy was applied to an examination of the phase transition behavior of aqueous bilayer membranes of double-chain ammonium amphiphiles. Large spectral changes were observed at the respective gel-to-liquid crystal phase transitions (Tc) of the bilayers. The frequency change in the antisymmetric CH2 stretching band indicated formation of the gauche conformation at Tc. The ester groups became either hydrated or disordered in the liquid crystalline state, but the amide units remained strongly associated. It is concluded that intermolecular hydrogen bonding is not necessarily weakened at Tc, although the molecular packing is loosened.",

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AU - Nakashima, Naotoshi

AU - Yamada, Norihiro

AU - Kunitake, Toyoki

AU - Umemura, Junzo

AU - Takenaka, Tohru

PY - 1986/1/1

Y1 - 1986/1/1

N2 - Fourier transform infrared spectroscopy was applied to an examination of the phase transition behavior of aqueous bilayer membranes of double-chain ammonium amphiphiles. Large spectral changes were observed at the respective gel-to-liquid crystal phase transitions (Tc) of the bilayers. The frequency change in the antisymmetric CH2 stretching band indicated formation of the gauche conformation at Tc. The ester groups became either hydrated or disordered in the liquid crystalline state, but the amide units remained strongly associated. It is concluded that intermolecular hydrogen bonding is not necessarily weakened at Tc, although the molecular packing is loosened.

AB - Fourier transform infrared spectroscopy was applied to an examination of the phase transition behavior of aqueous bilayer membranes of double-chain ammonium amphiphiles. Large spectral changes were observed at the respective gel-to-liquid crystal phase transitions (Tc) of the bilayers. The frequency change in the antisymmetric CH2 stretching band indicated formation of the gauche conformation at Tc. The ester groups became either hydrated or disordered in the liquid crystalline state, but the amide units remained strongly associated. It is concluded that intermolecular hydrogen bonding is not necessarily weakened at Tc, although the molecular packing is loosened.

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A fourier transform infrared study of bilayer membranes of double-chain ammonium amphiphiles

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