Multichromophoric phthalocyanine-(perylenediimide)8 molecules: A photophysical study

Sebastian Albert-Seifried, Chris E. Finlayson, Frederic Laquai, Richard H. Friend, Timothy M. Swager, Paul H.J. Kouwer, Michal Juríček, Heather J. Kitto, Sanne Valster, Roeland J.M. Nolte, Alan E. Rowan

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We describe the synthesis of a series of phthalocyanine (Pc)-perylenediimide (PDI)8 "octad" molecules, in which eight PDI moieties are attached to a Pc core through alkyl-chain linkers. There is clear spectroscopic evidence that these octads can exist as non-aggregated "monomers" or form aggregates along the Pc cores, depending on the type of Pc and the solvent medium. In the low dielectric constant solvents, into which the octads are soluble, photoexcitation of the PDI units leads to rapid energy transfer to the Pc centre, rather than a charge separation between moieties. In octad monomers, the Pc singlet excited-state decays within tens of ps, whereas the excitons are stabilised in the aggregated form of the molecules, typically with lifetimes in the order of 1-10 ns. By contrast, in an octad design in which π-π interactions are suppressed by the steric hindrance of a corona of incompatible glycol tails around the molecule, a more straightforward photophysical interaction of Förster energy transfer between the PDI moieties and Pc core may be inferred. We consider these molecules as prototypical multichromophoric aggregates, giving delocalised states with considerable flexibility of design.

Original languageEnglish (US)
Pages (from-to)10021-10029
Number of pages9
JournalChemistry - A European Journal
Volume16
Issue number33
DOIs
StatePublished - Sep 3 2010

Keywords

  • Chromophores
  • Energy transfer
  • Intermolecular aggregation
  • Perylenes
  • Phthalocyanines

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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