EPR studies of electron transfer processes in composites of substituted sexithiophenes with fullerene derivatives

Anna Lisa Maniero; Luigi Pasimeni; Giovanna Barbarella; Massimo Zambianchi; Maurizio Prato

doi:10.1117/12.283757

1 November 1997 EPR studies of electron transfer processes in composites of substituted sexithiophenes with fullerene derivatives

Anna Lisa Maniero, Luigi Pasimeni, Giovanna Barbarella, Massimo Zambianchi, Maurizio Prato

Author Affiliations +

Proceedings Volume 3142, Fullerenes and Photonics IV; (1997) https://doi.org/10.1117/12.283757
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

We have examined by EPR spectroscopy a series of films made by composites of hexamethyl and tetramethylsulfanyl substitutes sexithiophenes (T₆) with C₆₀ and C₆₀ derivatives. We have found that photoinduced electron transfer (PET) from donor to acceptor molecules occurs in mixed films of C₆₀ with hexamethyl-T₆ and in composites of methylsulfanyl substituted T₆ with fullerene derivatives. Persistent electron transfer in the ground state was also observed. Spin polarization of the emissive EPR signal attributed to T₆⁺ catio in hexamethyl-T₆/C₆₀ composite is consistent with the formation of the radicals from a non-polarized triplet exciplex which gives rise to a loose radical pair after the PET process. In the mixed film of tetramethylsulfanyul-T₆ and C₆₀ polymerized with methyl methacrylate, time resolved EPR spectra reveal that a tightly bound radical pair is formed in which the partners are coupled by dipolar and exchange interactions. Such pair relaxes into a loose pair at later times.

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Anna Lisa Maniero, Luigi Pasimeni, Giovanna Barbarella, Massimo Zambianchi, and Maurizio Prato "EPR studies of electron transfer processes in composites of substituted sexithiophenes with fullerene derivatives", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); https://doi.org/10.1117/12.283757

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