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Dendrimer Generation Effects on the Photophysical Properties of Poly (Aryl Benzyl Ether) Dendrictic Zinc (Ⅱ) Phthalocyanines and the Dendritic Phthalocyanines-loaded Polymeric Nanoparticles

Author: HuangLiShan
Tutor: PengYiRu
School: Fujian Normal University
Course: Inorganic Chemistry
Keywords: Aryl benzyl ether branches zinc phthalocyanine complexes Electron transfer Energy transfer Polymer nano - ion Form Photophysical Properties
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 20
Quote: 0
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Abstract


In this paper, UV, steady-state fluorescence spectroscopy and time-resolved fluorescence spectroscopy to study the branches algebra the new carboxyl end groups and cyano 0-2 generations aryl benzyl ether branches zinc phthalocyanine complexes (GrZnPc (CN) the G2-ZnPc (CN) 16, a G1-ZnPc (COOH) 8 and G2-ZnPc (COOH) 16) intermolecular electron transfer and intramolecular energy transfer process. Dendritic phthalocyanine in an organic solvent mainly exist in monomeric form, fluorescence lifetime and fluorescence quantum yield lower rate, with the increase of the Generation. Relative cyano-terminated branches phthalocyanine, second-generation carboxyl phthalocyanine fluorescence lifetime and fluorescence quantum yield is reduced more obvious. Fluorescence quenching method of anthraquinone the G1-ZnPc (CN) 8 and G2-ZnPc (CN) 16, and MV2 ZnPc (COOH) 4, G1-ZnPc (COOH) 8 G2-ZnPc (COOH) 16 fluorescence quenching effect. With branches generation increases, the quenching constant Ksv reduce, the electron transfer rate constant magnitude reached 1011 L / (mol-s), are static quenching quenching process. By steady-state fluorescence spectroscopy and time-resolved fluorescence spectroscopy to study energy transfer process cyano end groups 1-2 generation aryl benzyl ether branches zinc phthalocyanine complexes. Calculated in two ways branches phthalocyanine energy transfer efficiency (ΦENT) consistent increases ΦENT value with the increase of the branches Generation, the G2-ZnPc (CN) 16 ΦENT value has reached 0.88, aryl, benzyl ether branches zinc phthalocyanine complexes is an efficient energy transfer system. Two surfactants with the carboxy end groups 0-2 substituting an aryl group, a benzyl ether branches zinc phthalocyanine complexes interaction. Cationic surfactant cetyl trimethyl ammonium bromide (CTAB) of the carboxyl group of the phthalocyanine having a significant depolymerization. When the CTAB reach a certain concentration, the phthalocyanine exists as a monomer. By Zetasize particle size analyzer different concentrations the CTAB micelle load phthalocyanine particle size distribution, results show that the average particle size of the micelles increases with increasing micelle concentration. The anionic surfactant sodium dodecyl sulfate (SDS) only bit smaller resistance ZnPc (COOH) 4 of interaction, the fluorescence quenching process for a dynamic quenching. For the sterically hindered larger G1-ZnPc (COOH) 8 and G2-ZnPc (COOH), 16 SDS Add does not change the intensity and peak shift of the UV absorption spectra. By UV-visible spectroscopy and pyrene fluorescence spectrometry determination of amphiphilic block copolymer poly-L-lysine - PEG - lysine (PLL-PEG-PLL) the critical micelle concentration (CMC) of 0.1g / L. PLL-PEG-PLL self-assembled morphology by transmission electron microscopy (TEM) study results show that, the block concentration equal to the CMC, the micelles form a cocoon-like concentration greater than the CMC, micelles showed spherical. PLL-PEG-PLL with the carboxy end groups 0-2 substituting the aryl benzyl ether branches zinc phthalocyanine self assemble into the polymer nanoparticles G1-ZnPc (COOH) 8 / m and G2-ZnPc (COOH) 16 / m. AFM and TEM studies of the impact of different block the concentration of the a different algebra polymer nano-particle morphology. G1-ZnPc (COOH) 8 / m polymer nanoparticles are spherical, and the particle diameter is increased with the increase of the concentration of block; G2-ZnPc (COOH) 16 / m in a lower concentration of the block, showing spherical and spindle, the concentration increases occurred mainly spherical, sometimes cocoon shaped, exists only when the concentration reached 0.5 g / L, the spherical nanoparticles. By fluorescence spectrometry and UV-visible spectroscopy to study the photophysical properties of to load 1-2 generations of water-soluble tree phthalocyanine zinc complex objects polymer nanoparticles. For the same phthalocyanine polymer nanoparticles, the block concentration will result in increased the polymer nanoparticle fluorescence intensity.

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