Dipartimento di Chimica "G. Ciamician", Università di Bologna, via Selmi 2, 40126 Bologna, Italy.
Photochem Photobiol Sci. 2018 Jun 13;17(6):734-740. doi: 10.1039/c8pp00062j.
Among the plethora of photochromes reported so far, azobenzene has been proven to be the most suitable photoswitch for molecular systems and materials, due to its highly efficient and clean E-Z photoisomerization. Here we report two ammonium-based molecular axles bearing one or two p-cyanoazobenzene units at the extremities, able to form pseudorotaxanes with a crown ether macrocycle. The photochemistry of these compounds was studied in the isolated forms and in the pseudorotaxanes, showing that the functionalization speeds up the threading process without affecting the photochemical properties of the system. These results suggest that the investigated pseudorotaxanes can form the basis of new prototypes of artificial molecular-level pumps.
到目前为止，已报道的众多光致变色化合物中，由于其高效且清洁的 E-Z 光异构化，偶氮苯已被证明是最适合用于分子体系和材料的光开关。在这里，我们报告了两种基于铵的分子轴，其两端带有一个或两个对氰基偶氮苯单元，能够与冠醚大环形成假轮烷。这些化合物的光化学性质在孤立形式和假轮烷中进行了研究，结果表明功能化加速了穿线过程，而不影响体系的光化学性质。这些结果表明，所研究的假轮烷可以作为新型人工分子水平泵的原型。
