Photonic Control of Photoinduced Electron Transfer via Switching of Redox Potentials in a Photochromic Moiety

Yuichi Terazono, Gerdenis Kodis, Joakim Andréasson, Goojin Jeong, Alicia Brune, Thomas Hartmann, Heinz Dürr, Ana L. Moore, Thomas A. Moore, Devens Gust

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Abstract

A porphyrin (P) has been covalently linked to a photochromic dihydroindolizine moiety (DHI) to form a P-DHI dyad. When the dihydroindolizine is in its closed, spirocyclic form (DHIc), the photophysics of the attached porphyrin are unaffected. Irradiation with UV light opens the photochromic moiety to the betaine from (DHIo), which has a significantly higher reduction potential than DHIc. Light absorption by the porphyrin moiety of P-DHIo is followed by rapid (50 ps) photoinduced electron transfer to yield the P .+-DHIo .- charge-separated state This state recombines in 2.9 ps to give the ground state. Irradiation of P-DHIo with light at wavelengths >590 nm induces photoisomerization back to P-DHIc. Thermal closing can also be achieved. Thus, light is used to switch photoinduced electron transfer on or off. These principles may be useful in the design of molecular optoelectronic devices.

Original languageEnglish
Pages (from-to)1812-1814
Number of pages3
JournalJournal of Physical Chemistry B
Volume108
Issue number6
Publication statusPublished - Feb 12 2004

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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