Supramolecular Assembly And Aggregation Induced Fluorescence Of Tetraphenylethylene

Molecular self-assembly has been a research emphasis,as a variety of orderly functional materials can be prepared through the self-assembly.Electrostatic interaction is the only long-range force in molecular self-assembly.By introducing charged fluorescent molecules as building blocks,it is possible to obtain ordered multifunctional aggregates with fluorescence,such as complex coacervate micelles,Layer-by-Layer films,and fluorescence vesicles.In this paper,tetramethylene supramolecular assembly and aggregation-induced fluorescence were studied.The main contents and conclusions are as follows:1.The fluorescent molecule TPE-DPA with AIE effect coordinated with rare earth metal ions that the coordination ratio of rare earth ions to fluorescent molecules is 2:3,the coordination supramolecular have a amount of negative charge.The positively charged block copolymer was assembled with the metal coordination supramolecular and the coacervate micelles were obtained.The micellar diameter is 20 nm and the radius of the core is 7 nm.The coordination metal supramolecular Tb3+-TPE-DPA in the case of complete coordination was formed giant network structure and decreased the solubility in solution.When the block copolymer interacted with metal supramolecular Tb3+-TPE-DPA,the neutral moiety hydrophilic EO chain of PMVP41-PEO205 that enhances the solubility of Tb3+-TPE-DPA coordination supramolecular.The organic ligands form the supramolecular molecules and the rare earth metal ions have different fluorescence emission.The ratio of Tb3+-TPE-PMVP41-PEO205 and Eu3+-L2EO4-PMVP41-PEO205 was adjusted to 24:17,the white fluorescence solution was obtained.The CIE coordinates of the solution were(0.364,0.368)which is close to the standard white fluorescence CIE coordinates.The white fluorescent solution is strongly influenced by temperature and pH.Then,using the agarose solution to solidify the white fluorescent solution,further enhance the fluorescence intensity of the system.2.White fluorescence materials have excellent nature in the chemical sensors and optoelectronic materials.Though white emission was research focus,there is no metal supramolecular layers of preparation of white fluorescent film reported so far.Layer-by-Layer assembly technology is based on electrostatic interaction to build LBL film.By introduction of blue fluorescent ligand TPE-DPA and with the same coordination head group of L2EO4,through the rare earth metal ions and ligand interaction can be obtained three primary colors.The layer-by-layer assembly could overcome the problem of poor solubility of supramolecular assembly.(PEI/TPE/Tb3+)15/(PEI/Ln3+-L2EO4)5 white fluorescent film was obtained by adjusting the ratio of the fluorescent component,the assembly order and assembly layers.The fluorescent film have good stability for temperature,pH,gas and explosive,fixed height(49.5 nm)and good external quantum yield(11.74%),and a specific response to Cl2.3.Alkaline phosphatase is one of the protease which can recognizes the cancer cells.We are appropriately designed peptide molecules containing alkaline phosphatase receptors and modified peptide molecules onto APTES,the silicon sources P1-APTES molecules was obtained.P1-APTES and TEOS as a silicon source hydrolyzed with the TPE-BPA@8CTAB vesicles as template,which can be obtained with fluorescent hollow nanoparticles.The diameter is about 35 nm and the wall thickness is 10 nm.When the concentration of P1-APTES was 4 mM,the fluorescence of nanoparticles disappeared.While the concentration of P1-APTES:TEOS is 25 mM:1 mM,the nanoparticles with significant bio-application potential have fluorescence imaging of Hela cells and almost completely kill Hela cells after incubation for 24 h.