A High-Spin and Durable Polyradical: Poly(4-diphenylaminium-1,2-phenylenevinylene)
作者:Hidenori Murata、Masahiro Takahashi、Kazuaki Namba、Naoki Takahashi、Hiroyuki Nishide
DOI:10.1021/jo0302758
日期:2004.2.1
A purely organic, high-spin, and durable polyradical molecule was synthesized: It is based on the non-Kekulé- and non-disjoint design of a π-conjugated poly(1,2-phenylenevinylene) backbone pendantly 4-substituted with multiple robust arylaminium radicals. 4-N,N-Bis(4-methoxy- and -tert-butylphenyl)amino-2-bromostyrene 5 were synthesized and polymerized with a palladium−phosphine catalyst to afford
合成了一个纯有机的,高旋转性和持久性的多自由基分子:它是基于π-共轭的聚(1,2-亚苯基亚乙烯基)骨架经4个侧基侧接取代的非Kekulé-和不相交的设计而合成的芳基nium基团。4- Ñ,ñ -双(4-甲氧基-和-叔丁基苯基)氨基-2-溴苯乙烯5合成和用钯-膦催化剂,得到头-尾连接的多基前体(聚合1)。用冠醚溶解的亚硝酸根离子将1氧化,得到铵基自由基(1 +)在室温下于空气中具有持久性(半衰期> 1个月)。即使在室温下,通过磁化率,磁化强度,ESR和NMR测量也证明了1a +具有平均S =(4.5)/ 2的高自旋基态。