Electron transfer in Me-blocked heterodimeric alpha,gamma-peptide nanotubular donor-acceptor hybrids.
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.
Brea
Roberto J
RJ
Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago, E-15782 Santiago de Compostela, Spain.
Castedo
Luis
L
Granja
Juan R
JR
Herranz
M Angeles
MA
Sánchez
Luis
L
Martín
Nazario
N
Seitz
Wolfgang
W
Guldi
Dirk M
DM
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
D037741:Fullerenes; D006571:Heterocyclic Compounds; D045333:Nanotubes, Peptide; D010455:Peptides; C063887:tetrathiafulvalene