Picosecond charge separation and triplet formation in a closely spaced photosynthetic model system

U. Hofstra, T. J. Schaafsma, G. M. Sanders, M. Van Dijk, H. C. Van Der Plas, D. G. Johnson, Michael R Wasielewski

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Abstract

Intramolecular electron transfer has been investigated for three diphenyletioporphyrins covalently linked to an anthraquinone via a sulfonyloxy bridge at the ortho, meta or para substitution position of the phenyl groups of the porphyrin. The ortho-linked porphyrin is strongly folded and exhibits extremely fast charge separation (CS) and recombination (CR) between porphyrin and anthraquinone (kCS > 3 × 1011 s-1 and kCR = 5.9 × 1010 s-1 in CH2Cl2). The less-folded meta- and para-linked porphyrins have smaller electron transfer rate constants. For the ortho-linked compound in toluene a biphasic charge separation is observed. The triplet state is formed in high yield via fast intersystem crossing in the charge-separated state.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalChemical Physics Letters
Volume151
Issue number1-2
DOIs
Publication statusPublished - Oct 7 1988

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Hofstra, U., Schaafsma, T. J., Sanders, G. M., Van Dijk, M., Van Der Plas, H. C., Johnson, D. G., & Wasielewski, M. R. (1988). Picosecond charge separation and triplet formation in a closely spaced photosynthetic model system. Chemical Physics Letters, 151(1-2), 169-175. https://doi.org/10.1016/0009-2614(88)80090-3