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Proceedings Paper

Photoinduced electron transfer in fullerenes containing donor-bridge-acceptor dyads
Author(s): Dirk M. Guldi; Michele Maggini; Simonetta Mondini; Gianfranco Scorrano; Maurizio Prato
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Paper Abstract

Excited states properties of supramolecular fullerene donor- bridge-acceptor dyads were studied under various conditions. The steady-state emission yields of C60-Fc and Ru-C60 dyads are noticeably quenched relative to ruthenium and fullerene model compounds, respectively. This indicates that intramolecular electron-energy transfer plays a predominant contribution in the deactivation of the photoexcited chromophores, e.g. the singlet excited state of the fullerene core and ruthenium excited MLCT state. Picosecond and nanosecond resolved photolysis show that the photoexcited C60-Fc and Ru-C60 dyads transform rapidly into charge separated states. Characteristic NIR absorption of the fullerene (pi) -radical anions were complimented by a detailed UV/vis analysis and confirm the existence of long-lived radical pairs. The structure, length, and nature of the bridging spacer separating the two reactive centers had a significant impact on the lifetime nd stabilization of the charge separated states.

Paper Details

Date Published: 1 November 1997
PDF: 8 pages
Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); doi: 10.1117/12.283756
Show Author Affiliations
Dirk M. Guldi, Univ. of Notre Dame (United States)
Michele Maggini, Ctr. Meccanismi di Reazioni Organiche (Italy)
Simonetta Mondini, Ctr. Meccanismi di Reazioni Organiche (Italy)
Gianfranco Scorrano, Ctr. Meccanismi di Reazioni Organiche (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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