在双功能非结合型树突体中,能量和电子的转移
K R Justin Thomas1, Alexis L Thompson, Aathimanikandan V Sivakumar
1Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Journal of the American Chemical Society
|January 6, 2005
概括
合成的非结合型树枝状体通过一条顺序的通道将能量和电荷转化,从而实现高的传输效率. 灵活的脊柱影响能量和电荷转移,与刚性系统相比,它们对树突体大小的依赖性较小.
科学领域:
- 超分子化学 超分子化学
- 光物理学的光学物理学
- 材料科学 材料科学 材料科学
背景情况:
- 合成了带有外围捐赠体和核心接受体的非结合树突体.
- 迪亚利拉米诺皮烯单元作为能量和电子捐赠者.
- 一个西亚醇部分作为核心能量和电子受体.
研究的目的:
- 研究新型非结合树枝状物中的能量和电荷转移机制.
- 量化能量和电荷传输效率.
- 分析树突生成和脊柱灵活性对转移过程的影响.
主要方法:
- 合成基于乙烯的非结合型树枝状物.
- 稳态和时间分辨率的光谱测量.
- 光灭研究.
主要成果:
- 一个连续的能量转移-电子转移路径被确定为主导机制.
- 能量转移发生在皮秒时间尺度上,其次是纳秒时间尺度上的电荷转移.
- 实现了高能传输效率 (80-90%) 和充电传输效率 (70-80%).
- 灵活的乙烯骨干导致转移效率对树突基生成的依赖性较弱,与刚性系统相比.
结论:
- 合成的树枝状分子通过一条顺序的途径有效地道能量和充电.
- 光物理性质可以通过树突结构调整.
- 灵活的脊柱在控制树枝状系统中的能量和电荷转移过程方面具有优势.
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