delocalized spin distribution into the core parts of the star-shaped molecules. The polyradicals, 2 and 3, were in a high-spin state at low temperature, and the ferromagnetic behavior was enhanced for the polyradical with a higher molecular weight. Although an average S of 3 remained at 3/2 to 4/2, the polyradical 2 even with a spin concentration of 0.8 spin/unit revealed an average S of 7/2 to 8/2. The 1
通过在1,3,5-三
碘代苯或
1,3,5-三碘苯的存在下聚合2-
溴-4-(乙酰氧基苯基)
苯乙烯,合成被多个侧基苯氧基(2和3)4取代的星形聚(1,2-亚苯基亚
乙烯基)。 1,3,5-三(3',5'-二
碘苯基)苯为核心,通过简单的一锅Heck反应以及随后的
水解,
酚盐形成和非均相氧化。ESR光谱表明自旋自旋分布进入星形分子的核心部分。聚自由基2和3在低温下处于高自旋状态,分子量较高的聚自由基的
铁磁性能得到增强。尽管平均S为3仍保持在3/2至4/2,但是即使自旋浓度为0.8自旋/单位,多自由基2也显示出平均S为7/2至8/2。1,3,