Self-assembly of a chlorophyll-based cyclic trimer: Structure and intramolecular energy transfer

Victoria L. Gunderson, Michael R. Wasielewski

Research output: Contribution to journalArticle

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Small- and wide-angle X-ray scattering (SAXS/WAXS) and DOSY 1H NMR reveal that a zinc methyl pyrochlorophyllide a (Chl) derivative with a 3-pyridyl ligand at the Chl 20-position self-assembles in toluene solution into a cyclic trimer having a radius of 8.2 ± 0.1 Å. Femtosecond transient absorption spectroscopy shows that singlet-singlet annihilation occurs within the cyclic trimer as a result of energy transfer between the Chls that occurs with an (11 ± 1 ps)-1 rate constant, which agrees with the predictions of Förster theory, even though the Chl-Chl distances are comparable to the length of the Chl transition dipole.

Original languageEnglish
Pages (from-to)303-307
Number of pages5
JournalChemical Physics Letters
Publication statusPublished - Jan 29 2013


ASJC Scopus subject areas

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

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