Ultrafast photoinduced charge-shift reactions in electron donor-acceptor 9-arylacridinium ions

Guilford Jones, Mohammad S. Farahat, Scott R. Greenfield, David J. Gosztola, Michael R. Wasielewski

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Charge-shift species arising from intramolecular electron transfer have been identified for 9-aryl derivatives of the 10-methyl-acridinium ion through observation of red-shifted fluorescence emission bands and the appearance of radical (ion) transients (CH3CN and CH2Cl2 solvents) using laser flash photolysis. Rates of forward and return charge-shift processes have been determined, the former occurring in the 1 ps time domain with small effects associated with changes in solvent and the electron donor substituent. Rates for return electron transfer were a strong function of the donor oxidation potential and showed acceleration with decreased driving force (inverted behavior). The lifetimes for charge-shift intermediates could be 'tuned' over three orders of magnitude as the result of changes in acridinium structure and solvent.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalChemical Physics Letters
Volume229
Issue number1-2
DOIs
Publication statusPublished - Oct 21 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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