多层2Dpi堆叠的结合聚合物,基于伪双化代谢的 [2.2] 环旋
Subodh P Jagtap1, David M Collard
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.
具有pi堆叠染色体的新聚合物表现出很大的斯托克斯转移,表明稳定激发状态. 这种架构模仿半导体材料,为研究电荷载体和激子提供了一个平台.
科学领域:
- 有机电子学有机电子学
- 材料科学是一种材料科学.
- 摄影化学的使用.
背景情况:
- 皮系统之间的相互作用显著影响结合有机材料的电子结构.
- 之前的研究使用了刚性支架来将寡合物放在堆叠的排列中进行表征.
研究的目的:
- 为了合成和表征一种新型的聚合物,在多层排列中使用pi叠加的染色体.
- 研究扩展链间PI系统相互作用对兴奋状态放松和电子性质的影响.
主要方法:
- 制备一种新的聚合物,使用伪双胞胎异位化 [2.2] 环旋脚手架.
- 将1,4-bis(phenylethynyl) -2,5-dialkoxybenzene (PE(3)) 染色体纳入一个pi堆叠的多层方式.
- 光谱分析,包括测量斯托克斯转移.
主要成果:
- 新的聚合物表现出171纳米的巨大的斯托克斯移位,明显高于以前的模型 (约. 30纳米) 的距离.
- 这种巨大的转变表明,由于延长的链际pi系统相互作用,放松到稳定的"风扇"电子状态.
- 堆叠的二次体和区域异构体中较小程度的重叠并没有提供这种稳定性.
结论:
- 在聚合物架构中,扩展的多层pi堆叠稳定了激发状态,从而提高了排放特性.
- 聚合物的结构可以作为半导体薄膜中合聚合物段的模型.
- 这为探索有机半导体中的电荷载体和激子提供了一个有价值的平台.
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