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

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47 Citations (Scopus)

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

All Science Journal Classification (ASJC) codes

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

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