Sequential Energy and Electron Transfer in Polyisocyanopeptide-Based Multichromophoric Arrays

Ya-Shih Huang*, Xudong Yang, Erik Schwartz, Li Ping Lu, Sebastian Albert-Seifried, Christopher Edward Finlayson, Matthieu Koepf, Heather J. Kitto, Burak Ulgut, Matthijs B. J. Otten, Jeroen J. L. M. Cornelissen, Roeland J. M. Nolte, Alan E. Rowan, Richard H. Friend

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We report on the synthesis and detailed photophysical investigation of four model chromophore side chain polyisocyanopeptides: two homopolymers of platinum-porphyrin functionalized polyisocyanopeptides (Pt-porphyrin-PIC) and perylene-bis(dicarboximide) functionalized polyisocyanopeptides (PDI-PIC), and two statistical copolymers with different ratios of Pt-porphyrin and PDI molecules attached to a rigid, helical polyisocyanopeptide backbone. (1)H NMR and circular dichroism measurements confirm that our model Compounds retain a chiral architecture in the presence of the chromophores. The combination of Pt-porphyrin and PDI chromophores allows charge- and/or energy transfer, to happen. We observe the excitation and relaxation pathways for selective excitation of the Pt-potphyrin and PDI chromophores. Studies of photoluminescence and transient absorption on nanosecond and picosecond scales upon excitation of Pt-porphyrin chromophores in our multichromophoric assemblies show similar photophysical features to those of the Pt-porphyrin monomers. In contrast, excitation of perylene chromophores results in a series of energy and charge transfer processes with the Pt-porphyrin group and forms additional charge-transfer states, which behave as an intermediate state that facilitates electronic coupling in these multichromophoric systems.

Original languageEnglish
Pages (from-to)1590-1600
Number of pages11
JournalJournal of Physical Chemistry B
Volume115
Issue number7
Early online date31 Jan 2011
DOIs
Publication statusPublished - 24 Feb 2011

Keywords

  • TRANSFER DYNAMICS
  • SUPRAMOLECULAR ASSEMBLIES
  • SELF-ORGANIZATION
  • PERYLENE-PORPHYRIN DYADS
  • SINGLET-STATES
  • PHOTOINDUCED CHARGE SEPARATION
  • FULLERENE DYADS
  • BUILDING-BLOCKS
  • EXCITED-STATE PHOTODYNAMICS
  • LIGHT-HARVESTING ARRAYS

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