Photoinduced Electron Transfer and Hole Migration in Nanosized Helical Aromatic Oligoamide Foldamers
| dc.contributor.author | LI, Xuesong | |
| dc.contributor.author | MARKANDEYA, Nagula | |
| dc.contributor.author | JONUSAUSKAS, Gediminas
IDREF: 132366126 | |
| dc.contributor.author | MCCLENAGHAN, Nathan D. | |
| dc.contributor.author | MAURIZOT, Victor | |
| dc.contributor.author | DENISOV, Sergey A. | |
| dc.contributor.author | HUC, Ivan | |
| dc.date.accessioned | 2020-09-03T07:56:13Z | |
| dc.date.available | 2020-09-03T07:56:13Z | |
| dc.date.issued | 2016 | |
| dc.identifier.issn | 0002-7863 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/10847 | |
| dc.description.abstractEn | A 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.iso | en | |
| dc.title.en | Photoinduced Electron Transfer and Hole Migration in Nanosized Helical Aromatic Oligoamide Foldamers | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/jacs.6b05668 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of the American Chemical Society | |
| bordeaux.page | 13568-13578 | |
| bordeaux.volume | 138 | |
| bordeaux.hal.laboratories | Institut de Chimie & de Biologie des Membranes & des Nano-objets (CBMN) - UMR 5248 | * |
| bordeaux.hal.laboratories | Institut de Chimie & de Biologie des Membranes & des Nano-objets (CBMN, UMR 5248) | |
| bordeaux.issue | 41 | |
| bordeaux.institution | Université de Bordeaux | |
| bordeaux.institution | Bordeaux INP | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20the%20American%20Chemical%20Society&rft.date=2016&rft.volume=138&rft.issue=41&rft.spage=13568-13578&rft.epage=13568-13578&rft.eissn=0002-7863&rft.issn=0002-7863&rft.au=LI,%20Xuesong&MARKANDEYA,%20Nagula&JONUSAUSKAS,%20Gediminas&MCCLENAGHAN,%20Nathan%20D.&MAURIZOT,%20Victor&rft.genre=article |
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