Construciton And Morphology Of Supramolecular Polymers Based On Selfassembly Method

Supramolecular chemistry has been developed into a new science. It combinesmaterial science, life science, nanotechnology and information science and is one ofthe most important sources of the new concepts and high-tech in21st century. Thedevelopment of science research based on the supramolecular assembly has veryimportant significance. Supramolecule is an insurmountable level of the materialstructures. It is the source to create new materials and is the only way that must bepassed, i.e. from molecules to life, to the devices, to the functional materials, etc.（1） Light is an idea trigger to induce molecules to assemble into the architectures.Among the many inclusion complexes, azobenzene can be used to build thesupramolecular assemblies based on its photoisomeric properties. In this paper, wesynthesized a hydrophobic molecule with an alkyl tail on the azobenzene. Thismolecule could form an amphiphilic inclusion complex with-CD utilizing thehost-guest interactions of-CD and azobenzene. Different morphologies were obtainedat different ratio of water to THF. We also investigated their photo-responsiveproperties. We found that when the water percentage was80%⁹0%, nanowire andnanosphere can be observed. And the nanowire disappeared under the irradiation ofUV light. However, the nanowire formed again if the system was irradiated under thevisible light. This phenomenon indicated that the assembly was a reversible process.（2） Erbium (Er³⁺) and ytterbium (Yb³⁺) ions exhibit excellent research andapplication values due to their near-infrared luminescent properties which match thewave range of optical communication. In this paper, we have synthesized nanoscalesupramolecular polymers by reverse microemulsion method. Erbium and ytterbiumions were used as metal coordination sites and disodium terephthalate werepolydentate bridging ligands. The size of the particles was about200nm. Furthermore,we investigated the effects of w value, concentration of lanthanide ions and reactiontime on the morphologies of nanoparticles. The near-infrared optical properties ofparticles were also investigated initially.