1 November 1997 EPR studies of electron transfer processes in composites of substituted sexithiophenes with fullerene derivatives
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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, 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); doi: 10.1117/12.283757; https://doi.org/10.1117/12.283757
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