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Proceedings Paper

EPR studies of electron transfer processes in composites of substituted sexithiophenes with fullerene derivatives
Author(s): Anna Lisa Maniero; Luigi Pasimeni; Giovanna Barbarella; Massimo Zambianchi; Maurizio Prato
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Paper 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.

Paper Details

Date Published: 1 November 1997
PDF: 8 pages
Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); doi: 10.1117/12.283757
Show Author Affiliations
Anna Lisa Maniero, Univ. degli Studi di Padova (Italy)
Luigi Pasimeni, Univ. degli Studi di Padova (Italy)
Giovanna Barbarella, Area Ricerca di Bologna (Italy)
Massimo Zambianchi, Area Ricerca di Bologna (Italy)
Maurizio Prato, Univ. degli Studi di Trieste (Italy)

Published in SPIE Proceedings Vol. 3142:
Fullerenes and Photonics IV
Zakya H. Kafafi, Editor(s)

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