Photoinduced electron transfer in a donor-acceptor dyad oriented by an aligned nematic liquid crystal solvent

Louise Sinks, Michael J. Fuller, Wenhao Liu, Michael J. Ahrens, Michael R. Wasielewski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Ultrafast photoinduced charge separation in the donor-acceptor dyad, N-(10-phenyl-10-H-phenothiazine)-9-cyano-1,6-bis(3,5-di-tert-butylphenoxy) -perylene-3,4-dicarboximide (CNPMI-PTZ) occurs readily in both toluene and benzonitrile. When CNPMI-PTZ is dissolved in the nematic liquid crystal 4-(n-pentyl)-4′-cyanobiphenyl (5CB) and the mixture is incorporated into a cell whose interior surfaces are coated with a rubbed polymer, both the liquid crystal director and CNPMI-PTZ align parallel to the rub direction. This geometry allows selective excitation of the CNPMI chromophores aligned along the director using linearly polarized light. Transient absorption measurements using aligned CNPMI-PTZ are compared to those obtained in isotropic solvents. It is found that both charge separation and charge recombination are adiabatic in the aligned 5CB and the charge transfer kinetics are slow relative to the motions of the aligned donor-acceptor molecule. The adiabaticity leads to enhanced ion pair lifetimes, which most likely will prove useful for designing systems for the photoconversion of solar energy.

Original languageEnglish (US)
Pages (from-to)226-234
Number of pages9
JournalChemical Physics
Volume319
Issue number1-3
DOIs
StatePublished - Dec 7 2005

Keywords

  • Adiabaticity
  • Charge separation
  • Electron transfer
  • Femtosecond
  • Femtosecond spectroscopy
  • Liquid crystals
  • Photochemistry
  • Solvent dynamics

ASJC Scopus subject areas

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

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