Photoinduced Bimolecular Electron Transfer in Ionic Liquids: Cationic Electron Donors

Boning Wu, Min Liang, Nicole Zmich, Jasmine Hatcher, Sharon I. Lall-Ramnarine, James F. Wishart, Mark Maroncelli, Edward W. Castner

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Abstract

Recently, we have reported a systematic study of photoinduced electron-transfer reactions in ionic liquid solvents using neutral and anionic electron donors and a series of cyano-substituted anthracene acceptors [ Wu, B.; Maroncelli, M.; Castner, E. W., Jr. Photoinduced Bimolecular Electron Transfer in Ionic Liquids. J. Am. Chem. Soc. 139, 2017, 14568 ]. Herein, we report complementary results for a cationic class of 1-alkyl-4-dimethylaminopyridinium electron donors. Reductive quenching of cyano-substituted anthracene fluorophores by these cationic quenchers is studied in solutions of acetonitrile and the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. Varying the length of the alkyl chain permits tuning of the quencher diffusivities in solution. The observed quenching kinetics are interpreted using a diffusion-reaction analysis. Together with results from the prior study, these results show that the intrinsic electron-transfer rate constant does not depend on the quencher charge in this family of reactions.

Original languageEnglish
Pages (from-to)2379-2388
Number of pages10
JournalJournal of Physical Chemistry B
Volume122
Issue number8
DOIs
Publication statusPublished - Mar 1 2018

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Wu, B., Liang, M., Zmich, N., Hatcher, J., Lall-Ramnarine, S. I., Wishart, J. F., Maroncelli, M., & Castner, E. W. (2018). Photoinduced Bimolecular Electron Transfer in Ionic Liquids: Cationic Electron Donors. Journal of Physical Chemistry B, 122(8), 2379-2388. https://doi.org/10.1021/acs.jpcb.7b12542