Dynamic monolayer behavior of a photo-responsive azobenzene surfactant
Dynamic monolayer behavior of a photo-responsive azobenzene surfactant
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光响应偶氮苯表面活性剂的动态单层行为
DOI：
10.1016/s0927-7757(99)00560-9
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
P. Stroeve
中科院分区：
文献类型：
--
作者：
I. Kim;J. Rabolt;P. Stroeve
根据 360 和 420 nm 波长光的表面压力调制，在空气-水界面观察到偶氮苯表面活性剂的光响应行为。单层变化的表面压力响应取决于朗缪尔单层的压缩程度（以每个分子的面积表示）以及朗缪尔层形成过程中的光照条件。偶氮苯发色团需要分子空间进行光致异构化，从而导致空气-水界面的表面压力变化。由于空间位阻和 H 聚集体的形成，紧密堆积的反式分子在 360 nm 下不会完全转化为顺式状态。庞大的顺式发色团确实会转变为反式状态。 Langmuir-Blodgett (LB) 薄膜的紫外-可见光谱相对于氯仿溶液中偶氮苯表面活性剂的紫外-可见光谱蓝移 17 nm，表明形成了 H 聚集体。 Langmuir-Blodgett 薄膜根据压缩过程中的光波长表现出不同的分子构象。
Photo-responsive behavior of an azobenzene surfactant is observed at the air–water interface in terms of the surface pressure modulation with 360 and 420 nm wavelength light. The surface pressure response of the monolayer changes depends on the degree of compression of the Langmuir monolayer, expressed in terms of the area per molecule, as well as the light condition during the formation of the Langmuir layer. The azobenzene chromophore requires molecular space to undergo photoisomerization, which causes surface pressure changes at the air–water interface. Closely packed trans molecules do not fully convert to the cis state under 360 nm due to the steric hindrance and formation of H-aggregates. The bulky cis chromophores do convert to the trans state. Ultraviolet-visible spectra of Langmuir–Blodgett (LB) films are blue shifted 17 nm relative to the UV-visible spectra for the azobenzene surfactant in chloroform solutions, indicating formation of H aggregates. Langmuir–Blodgett films show different molecular conformation depending on the light wavelength during compression.
影响因子：
3.9
作者：
T. Kawai;J. Umemura;T. Takenaka
通讯作者：
T. Kawai;J. Umemura;T. Takenaka