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首页> 外文期刊>Chemistry: A European journal >Water-Soluble Spiropyrans with Inverse Photochromism and Their Photoresponsive Electrostatic Self-Assembly
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Water-Soluble Spiropyrans with Inverse Photochromism and Their Photoresponsive Electrostatic Self-Assembly

机译：具有逆光学变色的水溶性螺旋晶体及其光反应静电自动组装

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摘要

A new type of light responsive nanoscale assemblies based on water-soluble spiropyrans is presented. We have synthesized four anionic spiropyrans bearing multiple sulfonate groups and investigated their photochromic behavior in aqueous solution. Depending on the pH, either inverse photochromism (acidic conditions) or normal photochromism (alkaline conditions) is found. Kinetic data for the interconversion of the spiropyran and merocyanine isomers including the subsequent slow hydrolysis have been obtained by UV/Vis spectroscopy. The results show that the spiropyrans undergo hydrolysis in both alkaline and acidic solution, while in the latter the rate is far slower than in the former. This prolonged hydrolytic stability together with the inverse photochromism under acidic conditions makes the sulfonated spiropyrans suitable to build photoresponsive nanostructures with cationic polyelectrolytes. We show how the self-assembly process is driven by electrostatic interactions and how the spiropyrans' photochromic property allows the size control of the supramolecular objects by visible light. The assembly size is characterized by dynamic light scattering and TEM. In addition, UV/Vis and fluorescence spectroscopy and z-potential measurements help to explain the size change upon visible light irradiation.
机译：提出了一种基于水溶性螺旋晶体的新型光响应纳米级组件。我们已经合成了四个阴离子螺丝网，携带多个磺酸盐基团，并在水溶液中研究了它们的光致变色行为。根据pH，发现逆光学变色（酸性条件）或正常光致变色（碱性条件）。用于通过UV / VI光谱法获得包括随后的缓慢水解的螺旋吡喃和新硅酸尼异构体的动力学数据。结果表明，螺吡喃在碱性和酸性溶液中进行水解，而在后者的情况下，速率远远慢于前者。这种延长的水解稳定性与酸性条件下的逆光调校一起使得磺化螺丝吡喃适于与阳离子聚电解质构成光响应纳米结构。我们展示了自组装过程是如何由静电相互作用驱动的以及螺丝吡喃的光致变色性能如何通过可见光尺寸控制超分子物体。组装尺寸的特点是动态光散射和TEM。另外，UV / VI和荧光光谱和Z电位测量有助于在可见光照射时解释尺寸变化。

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