1. Electron transfer in Me-blocked heterodimeric [alpha],[gamma]-peptide nanotubular donor--acceptor hybrids
- Author
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Brea, Roberto J., Castedo, Luis, Granja, Juan R., Herranz, M. Angeles, Sanchez, Luis, Martin, Nazario, Seitz, Wolfgang, and Guldi, Dirk M.
- Subjects
Electron transport -- Research ,Nanotubes -- Research ,Science and technology - Abstract
Bio-inspired cyclopeptidic heterodimers built on [beta]-sheet-like hydrogen-bonding networks and bearing photoactive and electroactive chromophores on the outer surface have been prepared. Different cross-strand pairwise relationships between the side chains of the cyclic [alpha],[gamma]-peptides afford the heterodimers as three nonequivalent dimeric species. Steady-state and time-resolved spectroscopies clearly show an electron transfer process from [PI]-extended tetrathiafulvalene, covalently attached to one of the cyclopeptides, to photoexcited [60]fullerene, located on the complementary cyclopeptide. The charge-separated state was stabilized for up to 1 [mu]s before recombining and repopulating the ground state. Our current example shows that cyclopeptidic templates can be successfully used to form light-harvesting/lightconverting hybrid ensembles with a distinctive organization of donor and acceptor units able to act as efficient artificial photosystems. cyclic peptide nanotubes | fullerenes | self-assembly
- Published
- 2007