Near-Infrared Excitation of the peri-Xanthenoxanthene Radical Cation Drives Energy-Demanding Hole Transfer Reactions

Joseph A. Christensen, Jinyuan Zhang, Jiawang Zhou, Jordan N. Nelson, Michael R. Wasielewski

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Strongly oxidizing photosensitizers (superoxidants) based on organic radical cations are capable of driving energy-demanding reactions using low-energy photons. Here, we show that the peri-xanthenoxanthene radical cation (PXX+•) has an electronic excited state (D1) with a φ = 124 ps lifetime in CH3CN at 295 K. Photoexcitation of PXX+• covalently attached to electron deficient 9,10-bis(trifluoromethyl)anthracene (TMFA) using an 885 nm laser pulse drives oxidation of TFMA with unity quantum yield. Extending the PXX+•-TFMA dyad to a molecular triad having a 9,10-diphenylanthracene terminal hole acceptor, PXX+•-TFMA-DPA, and selectively exciting PXX+• results in formation of PXX-TFMA-DPA+• with a 46% quantum yield and a φ = 11.5 ± 0.6 ns lifetime. This work demonstrates that the PXX+• D1 electronic excited state can serve as a promising superoxidant for challenging oxidation reactions relevant to solar-energy applications.

Original languageEnglish
Pages (from-to)23364-23370
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number41
DOIs
Publication statusPublished - Oct 18 2018

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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