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Issue 24, 2007
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Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems

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Abstract

Carbon nanohorns (CNHs) have been covalently functionalized with pyrene chromophores forming dispersible nanohybrids in CH2Cl2. Their photo-physical properties have been investigated by complementary steady-state and time-resolved absorption and fluorescence spectroscopies as well as electrochemistry. Upon photo-excitation of CNH–pyrene nanohybrids, in the presence of hexyl-viologen dication (HV2+) and a hole trap, the HV˙+ was accumulated in the polar organic solvent. This observation suggests that photoinduced charge-separation takes place, producing CNH˙–pyrene˙+, which was further confirmed by observing pyrene˙+ in the nanosecond time-scale transient absorption spectra. From CNH˙, an electron is migrated to HV2+ and a hole shifts from pyrene˙+ to the hole trap, which suppresses the back electron transfer resulting in the persistence of HV˙+.

Graphical abstract: Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems

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The article was received on 02 Jan 2007, accepted on 21 Mar 2007 and first published on 11 Apr 2007


Article type: Paper
DOI: 10.1039/B618948B
Citation: J. Mater. Chem., 2007,17, 2540-2546
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    Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: charge-separation and electron-migration systems

    A. S. D. Sandanayaka, G. Pagona, J. Fan, N. Tagmatarchis, M. Yudasaka, S. Iijima, Y. Araki and O. Ito, J. Mater. Chem., 2007, 17, 2540
    DOI: 10.1039/B618948B

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