Structural characterization and photoelectrochemical properties of the self-assembled monolayers of tris(2,2′-bipyridine)ruthenium(II)-viologen linked compounds formed on the gold surface

Nao Terasaki, Tsuyoshi Akiyama, Sunao Yamada

Research output: Contribution to journalArticle

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Abstract

Steady-state spectroscopic studies of tris(2,2′-bipyridine)ruthenium(II)-viologen (Ru2+-V2+) linked thiol derivatives with different spacer-chain lengths (denoted as RuCnVCmS, where (n, m) = (11, 2), (7, 6), (7, 2), and (3, 6)) and different number ratios of Ru2+:V2+ = 1:2, Ru(C7VC6S), have been carried out, together with the corresponding reference compounds without Ru2+ or V2+. Absorption and cyclic voltammetric (CV) measurements indicated no appreciable electronic interactions between the two chromophores (Ru2+ and V2+) in the ground state. While luminescence spectral measurements revealed the occurrence of efficient photoinduced electron transfer from the photoexcited Ru2+(*Ru2+) to V2+. The electron transfer efficiency was also better for the 1:2 complex as compared with the corresponding 1:1 complex. Self-assembled monolayers (SAMs) of these compounds were fabricated on a gold electrode. XPS and CV measurements revealed immobilization of the compounds on the gold surface via gold-sulfur bonding. In the presence of triethanolamine, all modified electrodes with the Ru2+-V2+ linked compounds showed clear anodic photocurrents. The presence of the V2+ moiety was crucial for obtaining larger photocurrents A shorter spacer-chain length between the V2+ moiety and the terminal thiol group (m = 2) afforded a larger photocurrent, while a moderate spacer-chain length between the Ru2+ and the V2+ moieties was also a key for obtaining a larger photocurrent. A possible mechanism for photocurrent generation is discussed.

Original languageEnglish
Pages (from-to)8666-8671
Number of pages6
JournalLangmuir
Volume18
Issue number22
DOIs
Publication statusPublished - Oct 29 2002

Fingerprint

Viologens
Ruthenium
Self assembled monolayers
Photocurrents
Gold
ruthenium
photocurrents
gold
Chain length
spacers
Sulfhydryl Compounds
thiols
electron transfer
Triethanolamine
Electrodes
electrodes
Electrons
Chromophores
immobilization
Sulfur

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Structural characterization and photoelectrochemical properties of the self-assembled monolayers of tris(2,2′-bipyridine)ruthenium(II)-viologen linked compounds formed on the gold surface. / Terasaki, Nao; Akiyama, Tsuyoshi; Yamada, Sunao.

In: Langmuir, Vol. 18, No. 22, 29.10.2002, p. 8666-8671.

Research output: Contribution to journalArticle

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