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Ion-mediated electron transfer in a supramolecular donor-acceptor ensemble

Title
Ion-mediated electron transfer in a supramolecular donor-acceptor ensemble
Authors
Park J.S.Karnas E.Ohkubo K.Chen P.Kadish K.M.Fukuzumi S.Bielawski C.W.Hudnall T.W.Lynch V.M.Sessler J.L.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2010
Journal Title
Science
ISSN
0036-8075JCR Link
Citation
vol. 329, no. 5997, pp. 1324 - 1327
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Ion binding often mediates electron transfer in biological systems as a cofactor strategy, either as a promoter or as an inhibitor. However, it has rarely, if ever, been exploited for that purpose in synthetic host-guest assemblies. We report here that strong binding of specific anions (chloride, bromide, and methylsulfate but not tetrafluoroborate or hexafluorophosphate) to a tetrathiafulvalene calix[4]pyrrole (TTF-C4P) donor enforces a host conformation that favors electron transfer to a bisimidazolium quinone (BIQ 2+) guest acceptor. In contrast, the addition of a tetraethylammonium cation, which binds more effectively than the BIQ 2+ guest in the TTF-C4P cavity, leads to back electron transfer, restoring the initial oxidation states of the donor and acceptor pair. The products of these processes were characterized via spectroscopy and x-ray crystallography.
DOI
10.1126/science.1192044
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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