Reversible Symmetry-Breaking Charge Separation in a Series of Perylenediimide Cyclophanes

Adam F. Coleman, Michelle Chen, Jiawang Zhou, Jae Yoon Shin, Yilei Wu, Ryan M. Young, Michael R. Wasielewski

Research output: Contribution to journalArticle

Abstract

Excited-state symmetry-breaking charge separation (SB-CS) can offer an efficient pathway to solar energy capture and conversion. We synthesized a series of 1,6,7,12-tetrakis(4-t-butylphenoxy)perylene(3,4:9,10)bis(dicarboximide) cyclophane dimers with m-xylylene, p-xylylene, and 4,4′-diyldimethane-1,1′-biphenyl spacers and studied them with steady-state and time-resolved optical spectroscopies. Photoinduced SB-CS occurs in all three cyclophanes in CH2Cl2, with the SB-CS rate decreasing as the interchromophore distance is increased. Time-resolved emission spectroscopy and kinetic modeling reveal that the charge-separated state exists in pseudoequilibrium with the excited state prior to decay. Notably, the meta-spaced cyclophane also undergoes SB-CS in toluene within ∼100 ps, despite the lack of charge stabilization by the low dielectric constant solvent. These results demonstrate that SB-CS can occur across long distances and in weakly polar environments, which offers the possibility of harnessing SB-CS for solar energy capture and conversion.

Original languageEnglish
Pages (from-to)10408-10419
Number of pages12
JournalJournal of Physical Chemistry C
Volume124
Issue number19
DOIs
Publication statusPublished - May 14 2020

ASJC Scopus subject areas

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

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