siloxane–poly(amidoamine) (Si-PAMAM) dendrimers were synthesized by aza-Micheal reaction, and strong blue photoluminescence was observed even with the naked eye when these compounds were excited by a UV lamp. All of these compounds were not oxidated at all. Studies on the molecular structure showed that N → Si coordination bonds existed in these compounds, and those N → Si bonds caused the aggregation of carbonyl
Nonconventional Luminescence Enhanced by Silicone-Induced Aggregation
作者:Hang Lu、Ziqi Hu、Shengyu Feng
DOI:10.1002/asia.201700234
日期:2017.6.1
have synthesized some fluorescent siloxane derivatives and similar molecules without Si–O units by simple and efficient modification to investigate the role of Si–O units in the emission. It was found that the strong emission could be observed in dilute solutions of siloxane derivatives, but not in the carbon compounds. UV/Vis absorption, fluorescence spectra, nuclearmagneticresonance spectra, and theoretical
indicates that the introduction of the siloxane linkage into the interior of the dendrimers has significant effect on the flexibility of the dendrimer structures. Lanthanide complexes of the newly designed siloxane-based PAMAM dendrimers were obtained by complexing with Eu(III) and Tb(III), respectively. The luminescentproperties of the complexes in the solution were investigated. Narrow-width red and green
通过两种不同的方法合成了以1、3-双(3-氨基丙基)四甲基二硅氧烷(G0)为核心单元的0.5-2代硅氧烷基PAMAM树状聚合物。其结构的特征在于FTIR,1 H NMR,13C NMR,LC / MS,TGA和DSC。结果表明,第二种方法更合适,因为其合成过程简单,并且比第一种方法具有更高的收率。DSC分析表明,将硅氧烷键引入树枝状聚合物的内部对树枝状聚合物结构的柔韧性具有显着影响。通过分别与Eu(III)和Tb(III)络合获得了新设计的基于硅氧烷的PAMAM树状聚合物的镧系元素络合物。研究了溶液中配合物的发光性质。从G0.5,G1.5和G2.0的配合物中观察到窄宽度的红色和绿色发射光,表明分子内能量转移过程发生在配体和镧系元素离子之间。