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Self-Assembled Supramolecular Ferrocene−Fullerene Dyads and Triad: Formation and Photoinduced Electron Transfer

Self-Assembled Supramolecular Ferrocene−Fullerene Dyads and Triad: Formation and Photoinduced Electron Transfer

Authors :
Francis D'Souza
Atula S. D. Sandanayaka
Melvin E. Zandler
Yasuyuki Araki
Suresh Gadde
Osamu Ito
Raghu Chitta
Kevin Langenwalter
Source :
The Journal of Physical Chemistry C. 112:2222-2229
Publication Year :
2008
Publisher :
American Chemical Society (ACS), 2008.

Abstract

Supramolecular ferrocene−fullerene constructs in which the donor, ferrocene linked to a benzo-18-crown-6 entity (Fc-crown), was self-assembled with the acceptor, fullerene bearing one or two alkyl ammonium ions (NH3+−C60), yielding dyads or a triad, respectively. The newly formed conjugates were characterized by spectroscopic (fluorescence, electospray ionization-mass, and 1H NMR) and electrochemical methods. The adopted crown ether−alkyl ammonium ion binding strategy resulting in stable donor−acceptor conjugates was also supported by the computational studies performed at the DFT B3LYP/3-21G(*) level in addition to the binding constants obtained from fluorescence quenching studies. The experimentally calculated free-energy changes indicated exothermic light-induced charge-separation process. Accordingly, efficient photoinduced charge-separation processes were confirmed by the combination of the time-resolved fluorescence and nanosecond transient absorption spectral measurements. The rates of charge recom...

Details

ISSN :
19327455 and 19327447
Volume :
112
Database :
OpenAIRE
Journal :
The Journal of Physical Chemistry C
Accession number :
edsair.doi...........4615740088f321843f26a7f1b8a35255
Full Text :
https://doi.org/10.1021/jp077699g