Photophysical properties of pyrene-functionalized poly(propylene imine) dendrimers

被引：72

作者：

Baker, LA ^{[1
]}

Crooks, RM ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA

来源：

MACROMOLECULES | 2000年 / 33卷 / 24期

关键词：

D O I：

10.1021/ma001379c

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

:Four generations of poly(propylene imine) dendrimers have been covalently modified with pyrene moieties and examined by fluorescence spectroscopy. Emission and excitation spectra were obtained so that the generational dependence of the dendrimers, especially the extent of steric crowding, could be correlated to the photophysical properties of pyrene. In particular, the effect of dendrimer concentration and generation on pyrene-pyrene interactions was evaluated. More excimer emission was observed for higher generation dendrimers, while little or no evidence for interdendrimer interactions was observed over more than 2 orders of magnitude in dendrimer concentration. Excitation spectra revealed the presence of preassociated pyrene moieties. Protonation of the tertiary amine units was shown to increase monomer fluorescence significantly, while only slightly increasing the observed excimer fluorescence.

引用

页码：9034 / 9039

页数：6

共 72 条

[51] Quaternized poly(propylene imine) dendrimers as novel pH-sensitive controlled-release systems [J].