单壁碳纳米管携带共价连接的酸 - - 光诱导电子转移
Beatriz Ballesteros1, Gema de la Torre, Christian Ehli
1Departamento de Química OrgAnica, Universidad Autónoma de Madrid, Cantoblanco 28049-Madrid, Spain.
Journal of the American Chemical Society
|April 3, 2007
概括
单壁碳纳米管 (SWNTs) 用两种方法与phthalocyanines功能化,产生不同的比率. 观察到从激发的酸到SWNT的电子转移,稳定了基离子对.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 有机化学 有机化学
背景情况:
- 单壁碳纳米管 (SWNTs) 是具有独特电子性能的有希望的纳米材料.
- 聚氨酸 (Pc) 是多功能有机分子,具有有趣的光物理和电子特性.
- 用有机分子对SWNT的功能化可以调整它们的特性以适应特定的应用.
研究的目的:
- 通过两种不同的化学方法,合成和表征SWNTs与phthalocyanine添加剂功能化.
- 为了研究电子相互作用,特别是电子转移,在phthalocyanine部分和SWNT框架之间.
- 为了确定这些新型混合材料中的电荷分离和电荷重组动态.
主要方法:
- 通过与N-octylglycine和含有formyl的phthalocyanine的普拉托反应,HiPco SWNTs的侧墙功能化.
- 逐步的功能化涉及Prato循环添加与p-formyl-酸,然后以一个phthalocyanine分子进行化.
- 使用拉曼光谱,热重力测量分析 (TGA) 和光物理研究进行了表征.
- 暂时吸收光谱检测电子转移动态.
主要成果:
- 合成了两种不同的SWNT-phthalocyanine材料,碳/Pc-addenda比率各不相同.
- 观察到电子从光激发的酸转移到SWNTs的证据.
- 暂时的吸收证实了一电子氧化ZnPc离子的形成和SWNT范霍夫奇点的漂白.
- 电荷分离发生在2.0 x 10^10 s^-1时,电荷再组合发生在1.5 x 10^6 s^-1时,这表明基离子对稳定.
结论:
- 通过两种不同的合成途径,成功地实现了SWNTs与phthalocyanines的功能化.
- 从phthalocyanines到SWNTs的光诱导电子转移产生了一个稳定的基离子离子对.
- 这些SWNT-phthalocyanine混合材料显示出在需要电荷分离和稳定领域的应用潜力.
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