Enhancement of Energy Utilization in Light-Harvesting Dendrimers by the Pseudorotaxane Formation at Periphery.
In: Journal of the American Chemical Society, Jg. 131 (2009-07-01), Heft 25, S. 9100-9106
Online
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Zugriff:
A series of water-soluble naphthyl terminal-decorated dendrimers G0-3NapH were synthesized. Fluorescence studies reveal that strong interactions among peripheral chromophores occur in these dendrimers according to the intensive excimer emission and the low fluorescence quantum yields (Φ = .0.12, 0.097, 0.065, and 0.062 for G0-3NapH). Through assembly of dendrimer with cucurbit[7]uril (CB[7]), the well-defined pseudorotaxane assemblies GnNapH·xCB[7] (x = 4, 8, 16, 32 for n = 0-3, respectively) form and the energy dissipation is entirely suppressed, resulting in a dramatic increase of the fluorescence quantum yields of dendrimers (Φ = 0.18, 0.19, 0.19, and 0.20 for 0-3 generations, respectively). The noncovalent modification is a reversible process, and CB[7] can be unthreaded from the dendrimer periphery by adding 1-amimoadamantane, which can form a more stable complex with CB[7]. Furthermore, 9-anthracenecarboxylic acid (AN), an energy acceptor, was introduced into the dendritic system to investigate the harvested energy utilization. Steady-state fluorescence investigations demonstrate that the energy transfer efficiencies from naphthyl to AN in G3NapH·32CB[7]-AN and G2NapH·16CB[7]-AN are enhanced 100 and 70% compared with those without CB[7] complexation. This study provides a new strategy for developing controllable light-harvesting or -emitting dendritic systems. [ABSTRACT FROM AUTHOR]
Titel: |
Enhancement of Energy Utilization in Light-Harvesting Dendrimers by the Pseudorotaxane Formation at Periphery.
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Autor/in / Beteiligte Person: | Zeng, Yi ; Li, Yingying ; Li, Ming ; Yang, Guoqiang ; Li, Yi |
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Zeitschrift: | Journal of the American Chemical Society, Jg. 131 (2009-07-01), Heft 25, S. 9100-9106 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0002-7863 (print) |
DOI: | 10.1021/ja902998g |
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