PHOTODIMERIZATION OF TRANS-CINNAMIC ACID IN A BILAYER OF DIMETHYLDIOCTADECYLAMMONIUM BROMIDE
PHOTODIMERIZATION OF TRANS-CINNAMIC ACID IN A BILAYER OF DIMETHYLDIOCTADECYLAMMONIUM BROMIDE
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二甲基十八烷基溴化铵双层中反式肉桂酸的光二聚
DOI：
10.1246/bcsj.71.909
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发表时间：
1998
影响因子：
4
通讯作者：
Y. Sawaki
中科院分区：
文献类型：
--
作者：
Tomotaka Nakamura;K. Takagi;Y. Sawaki
研究了反式肉桂酸(TRANS-1)在二甲基二十八烷基溴化铵(2)浇铸膜中的光化学。铸膜的紫外光照射导致了高度选择性的合成头对头二聚体的形成，这表明在双层膜中有平行的反式-1取向。X-射线衍射仪、差示扫描量热仪和红外光谱分析表明，反式-1分子与2个极性头基相互作用形成了双层结构2。在40-60℃的加热条件下，薄膜中反式-1的光反应活性被显著地抑制，这归因于双层结晶度的提高。
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.