A fullerene molecular tip can detect localized and rectified electron tunneling within a single fullerene-porphyrin pair.
A fullerene molecular tip can detect localized and rectified electron tunneling within a single fullerene-porphyrin pair.
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DOI：
10.1073/pnas.0408474102
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发表时间：
2005-04
影响因子：
11.1
通讯作者：
T. Nishino;Takashi Ito;Y. Umezawa
中科院分区：
文献类型：
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作者：
T. Nishino;Takashi Ito;Y. Umezawa
富勒烯分子尖端用于检测单个卟啉分子的电子隧穿。发现卟啉的供电子部分通过它们之间的电荷转移相互作用局部发生电子隧穿。此外，在单个富勒烯-卟啉对内的电子隧穿表现出整流行为，其中电子只能在从卟啉到富勒烯的方向上被驱动。结果表明，局域电子隧穿使我们能够在空间上可视化参与电子隧穿的卟啉前沿轨道。此外，精馏表明富勒烯-卟啉对构成了一个分子整流器。我们相信分子尖端为实现分子电子学带来了分子间电子传输的洞察力。
A fullerene molecular tip was used to detect electron tunneling from a single porphyrin molecule. Electron tunneling was found to occur locally from an electron-donating moiety of the porphyrin to the fullerene through charge-transfer interaction between them. In addition, electron tunneling within the single fullerene-porphyrin pair exhibited rectifying behavior in which electrons can be driven only at the direction from the porphyrin to the fullerene. It is demonstrated that localized electron tunneling enables us to spatially visualize the frontier orbital of the porphyrin involved in electron tunneling. In addition, rectification demonstrates that the fullerene-porphyrin pair constitutes a molecular rectifier. We believe that molecular tips bring insight into intermolecular electron transmission toward realization of molecular electronics as shown here.