Cyclodextrins and their derivatives have been widely used in many fields such as science and technology as molecular receptors, artificial enzyme models and drug carriers because of their unique structures and characteristics. Cyclodextrins and their derivatives have hydrophobic cavities, so that they can interact with various guest molecules through non-covalent bonds to form "molecular capsules", thus changing the physical and chemical properties of guest molecules.
From molecular chemistry to supramolecular chemistrySupramolecular chemistry is beyond the category of molecular chemistry. As a new chemical discipline, it studies the chemistry of intermolecular interactions and molecular aggregates [1]. The development of supramolecular chemistry benefited from three chemists, C.J. Pedersen, J.M. Lehn and D.J. Cram, and C.J. Pederson discovered the coordination properties of crown ethers. D.J. Cram developed the host-guest chemistry [2]; J.M. Lehn proposed the concept of "supramolecular chemistry" [3]. In 2016, the Nobel Prize in Chemistry Jean-Pierre Sauvage, Sir J. Fraser Stoddart and Bernard L. Feringa were born, and their proposal of "Design and Synthesis of molecular machines" pushed supramolecular chemistry to the academic climax again [4][5][6].In recent years, supramolecular chemistry has developed rapidly, and contemporary chemists pay more attention to it [7]. Supramolecular chemistry is closely related to physics, informatics, materials science and life science [8]. A complex and ordered system with specific functions formed by weak intermolecular interactions among multiple molecules is supramolecular system [9][10][11][12]. Supramolecular chemistry gives people two important inspirations: First, weak intermolecular interactions can be superimposed and synergistically transformed into strong binding energy under certain conditions; Second, the supramolecular system assembled by molecules can have completely different properties from the original molecules. In recent years, supramolecular chemistry, combined with new materials-C60, carbon nanotubes and gold nanoparticles, has become one of the hot research topics [13].Cyclodextrins (CDs), a kind of macrocyclic compounds with D-glucopyranose units connected end to end, are the second generation main compounds in supramolecular chemistry research. Since its discovery, this kind of cyclic carbohydrate has attracted more and more attention of scientists. Cyclodextrins and their derivatives are widely used in the field of science and technology, which