Photosensitized reduction of methyl viologen using eosin-Y in presence of a sacrificial electron donor in water-alcohol mixture

Shafiqul D M Islam, Toshifumi Konishi, Mamoru Fujitsuka, Osamu Ito, Yuko Nakamura, Yoshiharu Usui

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Photoreduction of methyl viologen (MV2+) by eosin-Y (EY2-) in the presence of triethanolamine (TEOA) has been investigated in water-methanol mixture by means of steady-state photolysis and laser-flash photolysis in the visible/near-infrared regions. The complete conversion to the persistent methyl viologen radical cation (MV-+) was observed in the presence of lower concentrations of EY2- and excess TEOA. By laser-flash photolysis measurements, electron transfer was confirmed to occur from the triplet state of EY2- [3(EY2-)*] to MV2+ in the rate constants of ca 2.0 x 1010 M-1 s-1. The rates and efficiencies of production of MV-+ were found to be dependent on solvent compositions and concentrations of MV2+, ionic salt and TEOA. The back electron transfer reaction from MV-+ to EY- was retarded in the presence of TEOA, which supports that EY2- is reproduced by accepting an electron from TEOA. In the presence of excess TEOA, the indirect formation of MV-+ from EY-3-, which was produced by accepting an electron from TEOA, was confirmed. The contributions of both the oxidative and reductive routes of 3(EY2-)* for the MV-+ formation have been confirmed.

Original languageEnglish
Pages (from-to)675-680
Number of pages6
JournalPhotochemistry and Photobiology
Volume71
Issue number6
DOIs
Publication statusPublished - 2000 Jun 1
Externally publishedYes

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Paraquat
Eosine Yellowish-(YS)
photolysis
alcohols
Alcohols
flash
Electrons
Water
electron transfer
Photolysis
water
electrons
photochemical reactions
atomic energy levels
lasers
low concentrations
methyl alcohol
routes
salts
cations

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

Photosensitized reduction of methyl viologen using eosin-Y in presence of a sacrificial electron donor in water-alcohol mixture. / Islam, Shafiqul D M; Konishi, Toshifumi; Fujitsuka, Mamoru; Ito, Osamu; Nakamura, Yuko; Usui, Yoshiharu.

In: Photochemistry and Photobiology, Vol. 71, No. 6, 01.06.2000, p. 675-680.

Research output: Contribution to journalArticle

Islam, Shafiqul D M ; Konishi, Toshifumi ; Fujitsuka, Mamoru ; Ito, Osamu ; Nakamura, Yuko ; Usui, Yoshiharu. / Photosensitized reduction of methyl viologen using eosin-Y in presence of a sacrificial electron donor in water-alcohol mixture. In: Photochemistry and Photobiology. 2000 ; Vol. 71, No. 6. pp. 675-680.
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