期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 2, 页码 734-741出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja509470w
关键词
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资金
- MEXT of Japan [24750054, 21108002, 25107510, 26107510, 26110505, 26220801, 26248017, 26620039, 26708005, 2107, 2406, 2506, 2509]
- JSPS
- Noguchi Institute
- Asahi Glass Foundation
- Japan Association for Chemical Innovation
- Kao Foundation for Arts and Sciences
- Ogasawara Foundation for the Promotion of Science Emgineering
- Tokuyama Science Foundation
- Iketani Science and Technology Foundation
- Grants-in-Aid for Scientific Research [12J08850, 26708005, 25107002, 26110505, 26220801, 26248017, 25107510, 26620039, 26107510] Funding Source: KAKEN
Dendritic bis(terpyridine)iron(II) wires with terminal ferrocene units were synthesized on a Au(111) surface by stepwise coordination using a three-way terpyridine ligand, a ferrocene-modified terpyridine ligand, and Fe(II) ions. Potential-step chronoamperometry, which applied overpotentials to induce the redox of the terminal ferrocene, revealed an unusual electron-transport phenomenon. The current-time profile did not follow an exponential decay that is common for linear molecular wire systems. The nonexponentiality was more prominent in the forward electron-transport direction (from the terminal ferrocene to the gold electrode, oxidation) than in the reverse direction (from the gold electrode to the terminal ferrocenium, reduction). A plateau and a steep fall were observed in the former. We propose a simple electron transport mechanism based on intrawire electron hopping between two adjacent redox-active sites, and the numerical simulation thereof reproduced the series of asymmetric potential-step chronoamperometry results for both linear and branched bis(terpyridine)iron(II) wires.
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