Facile design of poly(3,4-ethylenedioxythiophene)-tris(2,2′- bipyridine)ruthenium (II) composite film suitable for a three-dimensional light-harvesting system

Chun Li, Tsukasa Hatano, Masayuki Takeuchi, Seiji Shinkai

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

It has been confirmed that octasulfonatocalix[8]arene (Calx-S8) and tris(2,2′-bipyridine)ruthenium (II) (Ru(bpy) 3 2+) can form a stable host-guest complex in aqueous solution. The binding constant for 1:1 [Calx-S8 8-·Ru(bpy) 3 2+] 6- complex formation was estimated to be (2.4±0.8)×10 4 dm 3 mol -1 by fluorescence titration, which indicates that the [Calx-S8 8-·Ru(bpy) 3 2+] 6- complex is the main species in 1:1 molar ratio aqueous solution of Calx-S8 and Ru(bpy) 3 2+. In situ UV-Vis spectroscopic measurements indicated that Ru(bpy) 3 2+ complexes can be readily deposited onto ITO electrode through electrochemical polymerization of 3,4-ethylenedioxythiophene (EDOT) using [Calx-S8 8-·Ru(bpy) 3 2+] 6- host-guest complex as a dopant anion owing to the electrostatic interaction between the cationic conductive polymer and the anionic host-guest complex. The loading degree of the composite film with Ru(bpy) 3 2+ can be determined by Lambert-Beer law modified for the two-dimensional concentration. The obtained composite film showed good photoelectric conversion properties in response to visible light irradiation. This is a novel photocurrent generation system in which the photoexcited state energy is efficiently collected by the conductive polymeric layer. Graphical abstract

Original languageEnglish
Pages (from-to)8037-8041
Number of pages5
JournalTetrahedron
Volume60
Issue number37
DOIs
Publication statusPublished - Sep 6 2004

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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