Xia Danyu, Wang Pi, Shi Bingbing
Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
Org Biomol Chem. 2017 Sep 20;15(36):7618-7622. doi: 10.1039/c7ob01441d.
Photochemistry plays an important role in our lives. It has also been a common tool in the laboratory to construct complicated systems from small molecules. Supramolecular chemistry provides an opportunity to solve some of the problems in controlling photochemical reactions via non-covalent interactions. By using confining media and weak interactions between the medium and the reactant molecule, the excited state behavior of molecules has been successfully manipulated. Pillararenes, a new class of macrocyclic hosts, have rarely been used in the field of photochemical investigations, such as the controlling of photo-induced reactions. Herein, we explore a synthetic macrocyclic host, a water-soluble pillar[6]arene, as a controlling tool to manipulate the photo-induced reactions (hydration) in water. A host-guest system in water based on a water-soluble pillar[6]arene and an azastilbene derivative, (E)-4,4'-dimethyl-4,4'-diazoniastilbene diiodide, has been constructed. Then this water-soluble pillar[6]arene was successfully employed to control the photohydration of the azastilbene derivative in water as a "protective agent".
光化学在我们的生活中起着重要作用。它也是实验室中从小分子构建复杂体系的常用工具。超分子化学为通过非共价相互作用解决光化学反应控制中的一些问题提供了契机。通过使用限制介质以及介质与反应物分子之间的弱相互作用，分子的激发态行为已得到成功调控。柱芳烃作为一类新型大环主体，在光化学研究领域（如光诱导反应的控制）中很少被使用。在此，我们探索一种合成大环主体——水溶性柱[6]芳烃，作为在水中操控光诱导反应（水合作用）的控制工具。基于水溶性柱[6]芳烃和氮杂二苯乙烯衍生物（E）-4,4'-二甲基-4,4'-二氮杂二苯乙烯二碘化物构建了一个水相主体-客体体系。然后，这种水溶性柱[6]芳烃作为“保护剂”成功用于控制氮杂二苯乙烯衍生物在水中的光水合作用。
