Direct observation of ultrafast excimer formation in covalent perylenediimide dimers using near-infrared transient absorption spectroscopy

Kristen E. Brown, Walter A. Salamant, Leah E. Shoer, Ryan Michael Young*, Michael R Wasielewski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

Energy transfer in perylene-3,4:9,10-bis(dicarboximide) (PDI) aggregates is often limited by formation of a low-energy excimer state. Formation dynamics of excimer states are often characterized by line shape changes and peak shift dynamics in femtosecond visible transient absorption spectra. Femtosecond near-infrared transient absorption experiments reveal a unique low-energy transition that can be used to identify and characterize this state without overlapping excited singlet-state absorption. Three covalently bound PDI dimers with differing PDI-PDI distances were studied to probe the influence of interchromophore electronic coupling on the PDI excimer transient spectra and dynamics.

Original languageEnglish (US)
Pages (from-to)2588-2593
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number15
DOIs
StatePublished - Aug 7 2014

Keywords

  • charge transfer
  • electronic coupling
  • femtosecond spectroscopy
  • molecular aggregates

ASJC Scopus subject areas

  • Materials Science(all)

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