title: Electron transfer in Me-blocked heterodimeric alpha,gamma-peptide nanotubular donor-acceptor hybrids.
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 micros before recombining and repopulating the ground state. Our current example shows that cyclopeptidic templates can be successfully used to form light-harvesting/light-converting hybrid ensembles with a distinctive organization of donor and acceptor units able to act as efficient artificial photosystems.
authors: Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago, E-15782 Santiago de Compostela, Spain.
authors: Roberto J
authors: RJ
authors: Brea
authors: Luis
authors: L
authors: Castedo
authors: Juan R
authors: JR
authors: Granja
authors: M Angeles
authors: MA
authors: Herranz
authors: Luis
authors: L
authors: Sánchez
authors: Nazario
authors: N
authors: Martín
authors: Wolfgang
authors: W
authors: Seitz
authors: Dirk M
authors: DM
authors: Guldi
mesh_terms: D002621:Chemistry / Q000379:methods; D019281:Dimerization; D004583:Electrons; D037741:Fullerenes / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry; D006860:Hydrogen Bonding; D008027:Light; D008956:Models, Chemical; D008958:Models, Molecular; D053758:Nanoparticles / Q000737:chemistry*; D045333:Nanotubes, Peptide / Q000737:chemistry; D010455:Peptides / Q000737:chemistry; D013997:Time Factors
chemical_list: D037741:Fullerenes; D006571:Heterocyclic Compounds; D045333:Nanotubes, Peptide; D010455:Peptides; C063887:tetrathiafulvalene