Construction And Properties Of Supramolecular Functional Materials Based On Nucleoside/Lanthanide Complexes

In the vibrant nature,small molecules spontaneously assemble into well-organized architectures through supramolecular self-assembly in water.New functional materials are constructed by supramolecular self-assembly,inspiring by the way of self-assembly in nature.That holds important significance in life science,material science,nanotechnology and other frontier fields of science,and has been widely researched.In this work,we have used nucleoside/lanthanide complexes to construct a series of responsive supramolecular materials by supramolecular self-assembly.The chemical structures of complexs is explored.The formation mechanism,luminescent properties and dynamic responsiveness of materials are studied.This work consists of seven chapters.In the first chapter,the research and development of supramolecular chemistry,nucleoside molecules,lanthanide complexes and supramolecular functional materials are reviewed,which provides an important theoretical basis for the work.In the second chapter,we realize the creation of flexible fluorescent microfibers which is based on thymidine/lanthanide complexes.The chemical structure of thymidine/lanthanide complexes is explored.The formation mechanism,micro-morphology and luminescent properties of microfibers are studied.In the third chapter,we design and synthesize six kinds of supramolecular luminescent hydrogels with dynamic response through adjusting the types of nucleosides and lanthanides.The formation mechanism,micro-morphology,rheological properties and optical properties of nucleoside/lanthanide hydrogels are explored.The responsiveness of hydrogels upon temperature,p H,anions and cationic stimuli is systematically discussed.The temperature,p H and ion fluorescence ON/OFF switches are constructed.In the fourth and fifth chapter,we synthesize highly tunable and responsive supramolecular luminescent hydrogels which is based on deoxyguanosine/lanthanide complexes through co-doped strategy.The micro-morphology,rheological properties,optical properties and energy transfer process of hydrogel are systematically studied.The responsiveness of hydrogels is systematically studied upon Ag~+,p H and temperature stimuli.The reversible fluorescent switch is prepared.Furthermore,a white light emission supramolecular hydrogel with fluorescence conversion and sol-gel conversion properties is prepared which is based on deoxyguanosine/terbium complexes and fluorescent dyes.The fluorescence conversion and sol-gel conversion properties of white light emission hydrogel are discussed.In the sixth chapter,we obtained a supramolecular fluorescent hydrogel based on deoxyguanosine/terbium complex and Rhodamine B.Fluorescent microflowers with chiral and polycrystalline properties are obtained by the interaction between guanosine triphosphate(GTP)molecule and gelation molecules after the addition of GTP in hydrogel.The micro-morphology and luminescent properties of microflowers are studied,and the formation process of microflowers is monitored in real time.In the last chapter,we summarize and prospect this work.Our work provides a new route for the preparation of luminescent materials.It is possible to make supramolecular self-assembly further control,precisely adjust and visualize by using fluorescence imaging technology.The multi-responsive luminescence hydrogel has great potential in smart materials,display materials,chemical/environmental sensors and data storage.