Efficient production of methyl viologen cation radicals using RuII systems

Talal S. Akasheh, Nathir A.F. Al-Rawashdeh

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A number of RuII-diimine complexes were used to photosensitize methyl viologen cation radical (MV+{radical dot}) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV+{radical dot}) = 1.88) was obtained for [Ru(bpz)2dpq]2+ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than any previously known for RuII complexes. The quantum yield is discussed in terms of the electron transfer quenching process and the cage escape effects which affect geminate recombination of the redox species. Time-resolved transient absorption spectra were used to study the formation of MV+{radical dot} and RuI in the case of [Ru(bpz)2(dpq)]2+.

Original languageEnglish
Pages (from-to)283-292
Number of pages10
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Issue number3
Publication statusPublished - Nov 15 1990
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Physics and Astronomy


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