Open AccessElectron transfer in Me-blocked heterodimeric α,γ-peptide nanotubular donor–acceptor hybrids
Author(s) -
Roberto J. Brea,
Luís Castedo,
Juan R. Granja,
M. Ángeles Herranz,
Luis Sánchez,
Nazario Martín,
W. Rudolf Seitz,
Dirk M. Guldi
Publication year - 2007
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.0609506104
Subject(s) - tetrathiafulvalene , chromophore , acceptor , electron transfer , covalent bond , chemistry , electron donor , electron acceptor , template , photoinduced electron transfer , photochemistry , combinatorial chemistry , materials science , nanotechnology , molecule , organic chemistry , catalysis , physics , condensed matter physics
Bio-inspired cyclopeptidic heterodimers built on β-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 α,γ-peptides afford the heterodimers as three nonequivalent dimeric species. Steady-state and time-resolved spectroscopies clearly show an electron transfer process from π-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 μs 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.