Fluorescence emission from PAMAM and PPI dendrimers.
Fluorescence emission from PAMAM and PPI dendrimers.
复制标题
DOI：
10.1016/j.jcis.2006.10.025
复制
发表时间：
2007-02
影响因子：
9.9
通讯作者：
Dong-jun Wang;T. Imae;M. Miki
中科院分区：
文献类型：
--
作者：
Dong-jun Wang;T. Imae;M. Miki
通过改变pH值、陈化时间、温度和浓度等实验参数，研究了不同端基的聚酰胺胺(PAMAM)树状大分子和聚丙烯亚胺(PPI)树状大分子在不同条件下的强荧光发射。在低pH或高温下，荧光强度的增加较快，但与树枝状大分子的浓度呈线性关系。PAMAM或PPI树状大分子中荧光基团的形成与质子化的叔胺基团密切相关。此外，叔胺的氧化起了重要作用，这显然是由空气中的氧气引起的。荧光衰减结果表明，随着温度的升高，发光的失活程度增加。在荧光显微镜上，树枝状大分子沿着纤维链模板发出蓝色光致发光。
A strong fluorescence emission from poly(amido amine) (PAMAM) dendrimers with different terminal groups or a poly(propylene imine) (PPI) dendrimer was studied under different conditions by varying experimental parameters such as pH value, aging time, temperature, and concentration. The increase of fluorescence intensity was fast at low pH or high temperature but linear with respect to dendrimer concentration. It was reasonable that the formation of a fluorescence-emitting moiety had a close relation to protonated tertiary amine groups in PAMAM or PPI dendrimers. Furthermore, oxidation of the tertiary amines was confirmed to play an important role, which was evidently caused by oxygen in air. The results of fluorescence decay indicated that the deactivation of luminescence was raised with increasing temperature. Dendrimers emitted blue photoluminescence along fiber chain templates on a fluorescent microscope.