Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 114, Issue 35, Pages 11496-11501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp105862q
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Funding
- Ministry of Education, Science, Sports, Culture, and Technology, Japan [20350035, 21020012]
- Grants-in-Aid for Scientific Research [20350035, 21020012] Funding Source: KAKEN
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The conformation of the carboxylic group of fatty acids in a Langmuir (L) monolayer film on water is described in relation to the aggregation property of the hydrocarbon chain. Polarization-modulation infrared reflection absorption spectra (PM-IRRAS) of L films of heptadecanoic acid (C-17), octadecanoic acid (C-18), and nonadecanoic acid (C-19) exhibit systematic spectral changes in both the C-H and C=O stretching vibration regions. Through a stabilization analysis of the L films at a high surface pressure, the C-19 L film has been found outstandingly stable exhibiting no film shrink, while the other two compounds exhibit a large shrink at high surface pressure. By taking into account the uniquely high aggregation property of the hydrocarbon chains of C-19, the three major bands arising from the C=O stretching vibration mode propose three types of molecular conformations about the carboxylic group, which are elucidated by a balance of the hydration of the carboxylic group, the chain length of the hydrocarbon chain, and the surface pressure.
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