长距离电子和孔运输通过DNA与结合的环金属化 (((III) 复合体
Fangwei Shao1, Jacqueline K Barton
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|November 8, 2007
概括
这项研究使用与DNA连接的复合体来研究DNA介导的电子和孔运输. 修改后的DNA基基作为陷,根据它们的位置揭示出不同的迁移路径.
科学领域:
- 摄影化学的使用.
- 超分子化学 超分子化学
- 生物物理化学 生物物理化学
背景情况:
- 在相当长的距离上,DNA调解电子和孔运输 (ET和HT).
- 摄影射探头对于启动和研究DNA中的这些电荷转移过程至关重要.
研究的目的:
- 开发一种模型系统,使用与DNA结合的 (III) 复合物.
- 为了调查由单个光反探测器启动的DNA介导的ET和HT.
- 使用修改后的DNA基来探测电荷迁移的方向性和机制.
主要方法:
- 一个循环金属化Ir (III) 复合物与DNA寡核酸的共价连接.
- 谱学和化温度分析以确认DNA间隔.
- 使用环胺替代基 (CPC和CPG) 作为电子和孔陷.
- 通过直接照射连接的IR组件来启动电荷传输.
主要成果:
- 通过其dppz连接体,Ir(III) 复合体通过其dppz连接体进入DNA复合体.
- ET和HT都是由DNA中的相同的光反探头启动的.
- 孔运输 (HT) 到循环氨酸 (CPG) 和循环氨酸 (CPC) 是有效的纯素通道.
- 电子运输 (ET) 导致还原性分解被观察到CPC在pyrimidine通道.
结论:
- 与Ir(III) 连接的DNA组件为研究DNA电荷传输提供了一个多功能平台.
- 该系统允许使用单个光反探头对ET和HT进行调查.
- 修改基的位置决定了观察到的电荷迁移路径 (ET与HT).
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