Application Of Nano-helix Based On Amphiphilic Self-assembly In Chiral Optics And Micro-pollution Treatment

The properties of materials depend on the interactions between the constituent elements,and supramolecular chemistry has played an important role in the field of materials.Supramolecular self-assembly refers to complex and ordered aggregates formed by the combination of elementary molecules through non-covalent bonds(such as hydrogen bonds,Van der Waals interactions,?-? stacking,hydrophobic interactions,etc.).One of the important means of structure and function has been valued and applied by more and more scientists around the world.Further,supramolecular chirality defines chirality at the supramolecular level.In nature,many organizations and structures are constructed based on self-assembly between molecules.Through the transmission of multiple signals and the coordination of different functions to complete complex life processes.How biological assemblies achieve multi-level transmission and function of chirality has made it increasingly important to study the mode of action of supramolecular chemistry.Inspired by nature,researchers are designing and synthesizing new building units and effectively regulating their assembly and functionalization.The contents of this subject are as the following parts:(1)Self-Assembly of a Bolaamphiphile Into Nanohelix and the White CPL Based on Chirality and Energy Transfer:Recent years,various chiral nanostructures with circularly polarized luminescence(CPL)activity have attracted more and more interests.In this work,we designed a chiral bolaamphiphile containing a naphthalene moiety(bola-1)and found it can self-assemble into uniform nanohelix.It was found that the nanohelix structures exhibited obvious CPL emission.Further,three fluorescent molecules,pyrene-1-carboxylic acid(D2),Rhodamine 110(D3)and Rhodamine B(D4),were introduced into the helical structures formed by bola-1,then the light-harvesting system containing bola-1 as donor and D2,D3,D4 as acceptor has been established.Based on the energy and chirality transfer from nanostructures of bola-1 to kinds of fluorescent molecules,the multicolor CPL materials were fabricated.By tuning the ratio of various fluorescence molecules,the white CPL emission can be obtained.This work extended the application of supramolecular nanostructure in chiroptical field.(2)Self-assembled Small Molecular Hydrogels for Removal of Heavy Metals and Organic Pollutants from Water:The removal of heavy metals and organic pollutions to obtain pure drink water is an urgent problem to be solved,in remoto village lack of efficient water purifier facility and industrial pollution areas.we tried to employ bolaamphiphiles based self-assembled hydrogel as filters and adsorbers to remove pollutions from water.Two bolaamphiphile HDGA and HDGH were selected as gelator,which can self-assembled into nanotube and nanofiber respectively.HDGA based gel can selectively adsorb the model organic dyes from the water,more interesting,HDGH based hydrogel high selectively retained heavy metals(Pb2+,Cd2+,Ni2+,Cu2+,Co2+)and no adsorption toward harmless metal ions(Na+,K+,Zn+,Ca2+,Mg2+).Therefore,an efficient water purification system was fabricated after series connected HDGA and HDGH hydrogel inside a filter column.