Single-line EPR spectra from radicals encapsulated in aggregates of amphiphilic block copolymers with hydrophobic dendritic pendants in water

被引：7

作者：

Tamano, Kana

Tanaka, Toshiyuki

Awaga, Kunio ^{[1
]}

Imae, Toyoko

Yusa, Shin-ichi

Shimada, Yoshihiko

机构：

[1] Nagoya Univ, Grad Sch Sci, Chikusa, Nagoya 4648602, Japan

[2] Nagoya Univ, Res Ctr Mat Sci, Chikusa, Nagoya 4648602, Japan

[3] Univ Hyogo, Grad Sch Engn, Himeji, Hyogo 6712201, Japan

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2006年 / 27卷 / 20期

关键词：

aggregate; amphiphiles; block copolymers; 1.1-diphenyl-2-picrylhydrazyl radical; encapsulation; ESR/EPR; hydrophobic dendritic pendant; radicals; UV-vis spectroscopy;

D O I：

10.1002/marc.200600499

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A water-insoluble organic 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical is solubilized. in aqueous solutions of aggregates of amphiphilic block copolymers with hydrophobic dendritic pendants. The number (100-200) of DPPH molecules solubilized in an aggregate, which is evaluated from UV-visible absorption spectra, is in agreement with that of the DPPH radicals determined from electron paramagnetic resonance (EPR) spectroscopy. The DPPH radicals are stably solubilized without decomposition in the polymer aggregates. The radicals exhibit a single-line EPR absorption, which is narrowed by the interspin interaction, and indicates the assembly formation of DPPH radicals in polymer aggregates. These results suggest the effective utilization of the DPPH radical as a spin-probe indicator in aqueous solutions.

引用

页码：1764 / 1768

页数：5