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Related Experiment Videos

Probing charge separation in structurally different C60/exTTF ensembles.

Marta C Díaz1, M Angeles Herranz, Beatriz M Illescas

  • 1Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, E 28040 Madrid, Spain.

The Journal of Organic Chemistry
|September 27, 2003
PubMed
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This study explores C60/exTTF ensembles, finding that increasing donor-acceptor separation with vinylene units significantly enhances radical pair lifetimes for photoinduced electron transfer. This indicates charge delocalization within the exTTF moiety.

Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Fullerenes (C60) and exTTF (9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene) are key components in electron donor-acceptor systems.
  • Understanding photoinduced electron transfer (PET) is crucial for developing advanced functional materials.

Purpose of the Study:

  • To investigate the impact of different C60/exTTF linkage strategies on photoinduced electron transfer.
  • To synthesize and characterize novel C60-exTTF ensembles with varying donor-acceptor separations.
  • To elucidate the behavior of charge-separated states and radical pair lifetimes.

Main Methods:

  • Synthesis of C60-exTTF ensembles using 1,3-dipolar cycloaddition and Diels-Alder reactions.
  • Cyclic voltammetry to assess redox behavior and electron-donor ability.

Related Experiment Videos

  • Steady-state and time-resolved photolysis, including transient absorption spectroscopy, to study PET dynamics.

    • Main Results:

    • New C60-exTTF ensembles were synthesized with exTTF separated from C60 by single bonds, one vinylene, or two vinylene units.
    • The trimethyl-substituted exTTF moiety exhibited strong electron-donor properties.
    • Photoinduced electron transfer quenching of the fullerene excited state was observed, forming C60*(-)-exTTF*+ charge-separated states.
    • Radical pair lifetimes increased with donor-acceptor separation, reaching 1465 ns with two vinylene units.

    Conclusions:

    • The positive charge in the exTTF radical cation is delocalized, not localized on the dithiole rings.
    • The linkage position (anthracene vs. dithiole ring) has minimal influence on PET.
    • Increasing the spacer length (vinylene units) between C60 and exTTF effectively enhances radical pair lifetimes, crucial for charge separation efficiency.