Picosecond dynamics of energy transfer in porphyrin-sapphyrin noncovalent assemblies

Stacy L. Springs, David Gosztola, Michael R. Wasielewski, Vladimír Král, Andrei Andrievsky, Jonathan L. Sessler

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Abstract

The picosecond dynamics of noncovalent ensembles for energy transfer based on anion chelation are reported. The photoactive noncovalent complexes are assembled via salt-bridge formation between carboxyl-containing porphyrin photodonors and a monoprotonated pentapyrrolic sapphyrin acceptor. These complexes are formed with a K(a) of ca. 103 M-1 upon mixing the receptor and substrate in their respective free-acid and free-base forms in CD2Cl2 (as judged by 1H NMR spectroscopic means). Upon irradiation at 417 nm, singlet-singlet energy transfer from the porphyrin to the sapphyrin subunit takes place readily with energy transfer dynamics that are consistent with a Forster-type mechanism. The title systems thus appear to be prototypic of a new kind of noncovalent energy transfer modeling that is predicated on the use of anion chelation.

Original languageEnglish
Pages (from-to)2281-2289
Number of pages9
JournalJournal of the American Chemical Society
Volume121
Issue number10
DOIs
Publication statusPublished - Mar 17 1999

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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