Electron transport dynamics in redox-molecule-terminated branched oligomer wires on Au(111)

Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Yoshihiko Nishimori, Seiji Miyashita, Hiroshi Nishihara

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)734-741
Number of pages8
JournalJournal of the American Chemical Society
Issue number2
Publication statusPublished - 2015 Jan 21
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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