稳定 (长键) 二极体通过不同阴离子,阴离子和无电荷的皮基的定量自我关联:结构,能量和光学转换
Jian-Ming Lü1, Sergiy V Rosokha, Jay K Kochi
1Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
Journal of the American Chemical Society
|October 2, 2003
概括
有机的pi-激素在溶液和固态中自发地形成不寻常的长键二极体. 这些pi-根二极体表现出独特的近红外吸收带,表明电荷转移过渡和电子移位.
科学领域:
- 超分子化学 超分子化学
- 有机电子 有机电子
- 频谱学是一种光谱学.
背景情况:
- 已知有机pi基,包括离子基 (TCNE-*, TCNQ-*, DDQ-*, CA-*) 和离子基 (OMB+*),以及中性基 (PHEN*),都能自我结合.
- 有机物质中的分子间相互作用对于它们的电子性质至关重要.
研究的目的:
- 研究各种有机皮基在溶液和固态中的自发自我结合.
- 描述由此产生的二维物种的结构和电子特性.
- 探索二维物种与它们的父pi基之间的关系.
主要方法:
- 使用定量UV-vis/EPR光谱仪测量pi-dimerization的和.
- 分析了光学转换,以评估电子合元件.
- 在溶液和结晶固体状态下对二度物种的表征.
主要成果:
- 不寻常的二度体具有广泛的平面间分离 (约. 3.05 Å) 通常由多种不同的有机pi-radicals形成.
- 这些二极管呈现出强烈的近红外吸收波段,这是电荷转移过渡的特征.
- 大量的,和电子合元件表明在二次体内有广泛的pi电子移位.
- 二维结构在溶液和固态中稳定,扰动最小 (<10%).
结论:
- 长键pi-radical二元体的自发形成是一个普遍的现象.
- 这些二极体具有独特的电子性质,这是由于显著的pi电子移位造成的.
- 在二磁二次体中观察到的光学转换与在二磁二次体中观察到的相对应,与穆利肯理论保持一致.
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