Photo-Controlled Supramolecular Assemblies Based on Azo Group

Azo compounds are a class of trans-cis(E/Z) photoisomerization compounds which have advantages of simple synthesis , high isomerization rate and efficiency , and resistance to photobleaching. Due to their outstanding photoisomeric properties and ability to form stable inclusion complexes with macrocyclic hosts , azo compounds have shown great potential application in many fields. In this review , we show the design principles , assembly mechanism, application and development of the photo-controlled supramolecular assemblies in topologically morphological regulation, drug delivery, smart materials and so on, which are constructed by host-guest interaction using azo modified cyclodextrin , bis-cyclodextrin bridged by azobenzene , crown ether derivatives , azo aromatic macrocyclic compounds as the hosts or azobenzene or azobenzene derivatives as guests. At the same time , we also discuss the opportunities and challenges of the development of such supramolecular assemblies, and hope to further promote the development of intelligent supramolecular assemblies.