Supramolecular Polymer Based On Orthogonal Metal-Ligand And Host-Guest Interactions

Supramolecular polymer is an important part of supramolecualr assemblies with dynamical polymeric structures which are prepared by various of reversible and highly directional non-covalent interactions with a number of monomers, such as hydrogen bonds, host-guest interactions, metal-ligand coordination and π-π stacking. It not only has the dynamic characteristic, but also shows some different external environmental stimuli responsive. At the same time, its self-assembly and disassembly process also show reversible. Motivated by these biological systems, chemists have been trying to fabricate artificial supramolecular architectures based on multiple supramolecular interactions. Significant variations of these resulting artificial polymers can be conveniently obtained without tedious synthesis. In general, the multiple non-covalent interactions involved in one supramolecular polymer system should be orthogonal to each other."Orthogonal assemblies" is that supramolecular polymers is fromed by different types of supramolecular interactions that do not interact with each other. Particularly, such self-assembly supramolecular polymers constructed by the selected orthogonal non-covalent interactions could generate complicated, hierarchically ordered materials with novel structures and properties.In this dissertation, we design and synthesis a linear supramolecular polymers. The linear supramolecular polymers, assembled via the combination of orthogonal terpyridine-Zn2+and benzo-21-crown-7/secondary ammonium salt recognition motifs, exhibit dynamic properties responsive to various external stimuli, which were confirmed by1H NMR, UV/Vis, DOSY and viscosity measurements. The complexation behaviour was discussed in chloroform/acetonitrile (3/1, v/v). The resulting supramolecular polymers exhibit multi-stimuli responsiveness capabilities, as triggered by heat, pH or a competitive ligand, cyclen. Such adaptive assemblies would be an appealing choice for further fabrication of intelligent supramolecular materials with tailored properties.