Bulletin of the Chemical Society of Japan p. 909 - 914 (1998)
Update date:2022-08-11
Topics:
Nakamura, Tomotaka
Takagi, Katsuhiko
Sawaki, Yasuhiko
The photochemistry of trans-cinnamic acid (trans-1) was studied in a cast film of dimethyldioctadecylammonium bromide (2), deposited from aqueous dispersions as a crystalline solid by the spontaneous vaporization of water. UV irradiation of the cast film resulted in a highly selective formation of the syn-Head-to-Head dimer, suggesting a parallel orientation of trans-1 within a bilayer film. Analyses with X-ray diffraction, differential scanning calorimetry, and IR spectra revealed the formation of a bilayer structure of 2 in which the molecules of trans-1 are dissolved to interact with 2 of the polar head groups. The photoreactivity of trans-1 in the cast film was found to be dramatically suppressed by heating at 40-60 °C, which is attributed to an improvement in the crystallinity of the bilayer.
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