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dc.contributor.authorBandi, Venugopal
dc.contributor.authorEl-Khouly, Mohamed E.
dc.contributor.authorOhkubo, Kei
dc.contributor.authorNesterov, Vladimir N.
dc.contributor.authorZandler, Melvin E.
dc.contributor.authorFukuzumi, Shunichi
dc.contributor.authorD'Souza, Francis
dc.identifier.citationBandi, Venugopal; El-Khouly, Mohamed E.; Ohkubo, Kei; Nesterov, Vladimir N.; Zandler, Melvin E.; Fukuzumi, Shunichi; D'Souza, Francis. 2013. Excitation-wavelength-dependent, ultrafast photoinduced electron transfer in bisferrocene/bf2-chelated-azadipyrromethene/fullerene tetrads. Chemistry-A European Journal, v.19:no.22: pp.7221-7230en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractDonor–acceptor distance, orientation, and photoexcitation wavelength are key factors in governing the efficiency and mechanism of electron-transfer reactions both in natural and synthetic systems. Although distance and orientation effects have been successfully demonstrated in simple donor–acceptor dyads, revealing excitation-wavelength-dependent photochemical properties demands multimodular, photosynthetic-reaction-center model compounds. Here, we successfully demonstrate donor– acceptor excitation-wavelength-dependent, ultrafast charge separation and charge recombination in newly synthesized, novel tetrads featuring bisferrocene, BF2-chelated azadipyrromethene, and fullerene entities. The tetrads synthesized using multistep synthetic procedure revealed characteristic optical, redox, and photo reactivities of the individual components and featured “closely” and “distantly” positioned donor–acceptor systems. The near-IR-emitting BF2-chelated azadipyrromethene acted as a photosensitizing electron acceptor along with fullerene, while the ferrocene entities acted as electron donors. Both tetrads revealed excitation-wavelength-dependent, photoinduced, electron-transfer events as probed by femtosecond transient absorption spectroscopy. That is, formation of the Fc+–ADP–C60.− charge-separated state upon C60 excitation, and Fc+–ADP.−–C60 formation upon ADP excitation is demonstrated.en_US
dc.description.sponsorshipNational Science Foundation (Grant No. CHE-1110942 to F.D.), Grant-in-Aid (No. 20108010 to S. F. and 23750014 to K.O.), and the Global COE (center of excellence) program of Osaka University from MEXT, Japan (WCU R31-2008-000-10010-0), and NRF/MEST, Korea (GRL 2010-00353).en_US
dc.publisherJohn Wiley and Sonsen_US
dc.relation.ispartofseriesChemistry-A European Journal;v.19, no.22
dc.subjectArtificial photosynthesisen_US
dc.subjectElectron transferen_US
dc.subjectX-ray analysisen_US
dc.titleExcitation-wavelength-dependent, ultrafast photoinduced electron transfer in bisferrocene/bf2-chelated-azadipyrromethene/fullerene tetradsen_US
dc.description.versionPeer reviewed
dc.rights.holderCopyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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