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Ultrafast photoinduced energy and electron transfer in multi-modular donor-acceptor conjugates

Title
Ultrafast photoinduced energy and electron transfer in multi-modular donor-acceptor conjugates
Authors
El-Khouly M.E.Wijesinghe C.A.Nesterov V.N.Zandler M.E.Fukuzumi S.D'Souza F.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2012
Journal Title
Chemistry - A European Journal
ISSN
0947-6539JCR Link
Citation
vol. 18, no. 43, pp. 13844 - 13853
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
New multi-modular donor-acceptor conjugates featuring zinc porphyrin (ZnP), catechol-chelated boron dipyrrin (BDP), triphenylamine (TPA) and fullerene (C 60), or naphthalenediimide (NDI) have been newly designed and synthesized as photosynthetic antenna and reaction-center mimics. The X-ray structure of triphenylamine-BDP is also reported. The wide-band capturing polyad revealed ultrafast energy-transfer (k ENT=1.0×10 12 s -1) from the singlet excited BDP to the covalently linked ZnP owing to close proximity and favorable orientation of the entities. Introducing either fullerene or naphthalenediimide electron acceptors to the TPA-BDP-ZnP triad through metal-ligand axial coordination resulted in electron donor-acceptor polyads whose structures were revealed by spectroscopic, electrochemical and computational studies. Excitation of the electron donor, zinc porphyrin resulted in rapid electron-transfer to coordinated fullerene or naphthalenediimide yielding charge separated ion-pair species. The measured electron transfer rate constants from femtosecond transient spectral technique in non-polar toluene were in the range of 5.0×10 9-3.5×10 10 s -1. Stabilization of the charge-separated state in these multi-modular donor-acceptor polyads is also observed to certain level. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/chem.201202265
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자연과학대학 > 화학·나노과학전공 > Journal papers
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