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Photoinduced Electron Transfer and Hole Migration in Nanosized Helical Aromatic Oligoamide Foldamers

dc.contributor.authorLI, Xuesong
dc.contributor.authorMARKANDEYA, Nagula
dc.contributor.authorJONUSAUSKAS, Gediminas
IDREF: 132366126
dc.contributor.authorMCCLENAGHAN, Nathan D.
dc.contributor.authorMAURIZOT, Victor
dc.contributor.authorDENISOV, Sergey A.
dc.contributor.authorHUC, Ivan
dc.date.accessioned2020-09-03T07:56:13Z
dc.date.available2020-09-03T07:56:13Z
dc.date.issued2016
dc.identifier.issn0002-7863
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/10847
dc.description.abstractEnA series of photoactive triads have been synthesized and investigated in order to elucidate photoinduced electron transfer and hole migration mechanism across nanosized, rigid helical foldamers. The triads are comprised of a central helical oligoamide foldamer bridge with 9, 14, 18, 19, or 34 8-amino-2-quinolinecarboxylic acid repeat units, and of two chromophores, an N -terminal oligo(para-phenylenevinylene) electron donor and a C-terminal perylene bisimide electron acceptor. Time-resolved fluorescence and transient absorption spectroscopic studies showed that, following photo-excitation of the electron acceptor, fast electron transfer occurs initially from the oligoquinoline bridge to the acceptor chromophore on the picosecond time scale. The oligo(para-phenylenevinylene) electron donor is oxidized after a time delay during which the hole migrates across the foldamer from the acceptor to the donor. The charge separated state that is finally generated was found to be remarkably long-lived (>80 mu s). While the initial charge injection rate is largely invariant for all foldamer lengths (ca. 60 ps), the subsequent hole transfer to the donor varies from 1 X 10(9) s(-1) for the longest sequence to 17 X 10(9) s(-1) for the shortest. In all cases, charge transfer is very fast considering the foldamer length. Detailed analysis of the process in different media and at varying temperatures is consistent with a hopping mechanism of hole transport through the foldamer with individual hops occurring On the subpicosecond time scale (k(ET) = 2.5 X 10(12) s(-1) in CH2Cl2). This work demonstrates :the possibility of fast long-range hole transfer over 300 angstrom. (through bonds) across a synthetic modular bridge, an achievement that had been, previously observed principally with DNA structures.
dc.language.isoen
dc.title.enPhotoinduced Electron Transfer and Hole Migration in Nanosized Helical Aromatic Oligoamide Foldamers
dc.typeArticle de revue
dc.identifier.doi10.1021/jacs.6b05668
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Chemical Society
bordeaux.page13568-13578
bordeaux.volume138
bordeaux.hal.laboratoriesInstitut de Chimie & de Biologie des Membranes & des Nano-objets (CBMN) - UMR 5248*
bordeaux.hal.laboratoriesInstitut de Chimie & de Biologie des Membranes & des Nano-objets (CBMN, UMR 5248)
bordeaux.issue41
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
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