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Photochemical charge separation in closely positioned donor-boron dipyrrin-fullerene triads

Title
Photochemical charge separation in closely positioned donor-boron dipyrrin-fullerene triads
Authors
Wijesinghe C.A.El-Khouly M.E.Subbaiyan N.K.Supur M.Zandler M.E.Ohkubo K.Fukuzumi S.D'Souza F.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2011
Journal Title
Chemistry - A European Journal
ISSN
0947-6539JCR Link
Citation
vol. 17, no. 11, pp. 3147 - 3156
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A series of molecular triads, composed of closely positioned boron dipyrrin-fullerene units, covalently linked to either an electron donor (donor1-acceptor1-acceptor2-type triads) or an energy donor (antenna-donor1-acceptor1-type triads) was synthesized and photoinduced energy/electron transfer leading to stabilization of the charge-separated state was demonstrated by using femtosecond and nanosecond transient spectroscopic techniques. The structures of the newly synthesized triads were visualized by DFT calculations, whereas the energies of the excited states were determined from spectral and electrochemical studies. In the case of the antenna-donor1-acceptor1-type triads, excitation of the antenna moiety results in efficient energy transfer to the boron dipyrrin entity. The singlet-excited boron dipyrrin thus generated, undergoes subsequent energy and electron transfer to fullerene to produce a boron dipyrrin radical cation and a fullerene radical anion as charge-separated species. Stabilization of the charge-separated state in these molecular triads was observed to some extent. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/chem.201002446
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자연과학대학 > 화학·나노과학전공 > Journal papers
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