Variation of excitation energy influences the product distribution of a two-step electron transfer: S2 vs S1 electron transfer in a Zn(II)porphyrin-viologen complex

Jonas Petersson, Mattias Eklund, Jan Davidsson, Leif Hammarström

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41 Citations (Scopus)

Abstract

(Figure Presented) We have, for the first time for molecular systems in solution, shown a case where the variation of excitation energy influences the product distribution of a two-step electron transfer. The photoexcitation was to the porphyrin-localized S2 state or either of the S1(v = 1) or S1(v = 0) states of an aqueous Zn(II)-meso- tetrasulphonatophenyl-porphyrin-methylviologen (ZnTPPS4-/MV 2+) complex. Both forward and back electron transfer occur on a subpicosecond time scale (τFET ≈ 0.2, τBET = 0.7 ps). The excess energy of the higher excitations partially survives both electron transfer steps. This is seen by different distributions of unrelaxed ground states, which are generated by the back electron transfer and has unique UV-vis spectroscopic signatures. State selective electron transfer opens interesting possibilities for reaction control, and the results represent initial steps in that direction

Original languageEnglish
Pages (from-to)7940-7941
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number23
DOIs
Publication statusPublished - Jun 17 2009

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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