Reversible self-organization of a UV-responsive PEG-terminated malachite green derivative: Vesicle formation and photoinduced disassembly
Reversible self-organization of a UV-responsive PEG-terminated malachite green derivative: Vesicle formation and photoinduced disassembly
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DOI：
10.1021/la063305l
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发表时间：
2007-03-27
期刊：
影响因子：
3.9
通讯作者：
Zhang, Xi
中科院分区：
文献类型：
--
作者：
Jiang, Yugui;Wang, Yapei;Zhang, Xi
本文描述了紫外响应性聚乙二醇封端的孔雀石绿绿色衍生物形成的囊泡的组装和分解。同时具有疏水性孔雀石绿色基团和亲水性PEG基团的紫外响应性两亲物在紫外照射前可在水中自组装成囊泡。然而，在UV照射时，光致变色部分可以电离成其相应的阳离子，导致这些囊泡的分解。此外，阳离子可以热恢复其电中性形式，并且分解的物质可以在热逆反应的基础上可逆地形成囊泡。逆反应是温度控制的，可以通过热处理加速。通过使用各种表征技术，例如，透射电子显微镜、动态光散射、紫外-可见光谱和核磁共振光谱，我们已经证实了囊泡结构可以通过上述处理形成、分解和恢复。这一系列的研究可以为刺激响应性分子组装体的形成和破裂机制提供新的见解，促进新的表面活性分子的设计和合成，用于制造具有设计功能的刺激响应性材料。
This paper describes the assembly and disassembly of vesicles formed by a UV-responsive poly(ethylene glycol) terminated malachite green derivative. The UV-responsive amphiphile with both a hydrophobic malachite green group and a hydrophilic PEG group can self-organize into vesicles in water before UV irradiation. However, upon UV irradiation, the photochromic moiety can be ionized to its corresponding cation, leading to the disassembly of these vesicles. In addition, the cation can thermally recover its electrically neutral form, and the disassembled species can form vesicles reversibly on the basis of a thermal reverse reaction. The reverse reaction is temperature-controlled and can be speeded up by thermal treatment. By using various characterization techniques, e.g., transmission electron microscopy, dynamic light scattering, UV-visible spectroscopy, and NMR spectroscopy, we have confirmed that the vesicle structures can be formed, disassembled, and recovered by the above-mentioned treatments. It is anticipated greatly that this line of research may provide new insights into the mechanism behind stimuli-responsive formation and rupture of molecular assemblies, facilitating the design and synthesis of new surface active molecules for the fabrication of stimuli-responsive materials with designed functions.