Through-space communication in a TTF–C<sub>60</sub>–TTF triad
作者:Frédéric Oswald、Stéphanie Chopin、Pilar de la Cruz、Jesús Orduna、Javier Garín、Atula S. D. Sandanayaka、Yasuyuki Araki、Osamu Ito、Juan Luis Delgado、Jack Cousseau、Fernando Langa
DOI:10.1039/b613466a
日期:——
A 2-pyrazolino[60]fullerene-based triad, possessing two TTF units connected with flexible long linkages, has been prepared. Fluorescence quenching was observed in polar and non-polar solvents, suggesting the existence of a through-space photoinduced charge separation process with rates faster than 3.8 Ã 109 sâ1 and with high efficiency (>0.85). The charge separated states were confirmed by transient absorption spectra in the visible and near-IR regions. The longest lifetime of the charge separated state was found to be 230 ns in CH2Cl2 solvent.
Synthesis and Photoinduced Intermolecular Electronic Acceptor Ability of Pyrazolo[60]fullerenes vs Tetrathiafulvalene
作者:Juan Luis Delgado、Pilar de la Cruz、Vicente López-Arza、Fernando Langa、Zhenhai Gan、Yasuyuki Araki、Osamu Ito
DOI:10.1246/bcsj.78.1500
日期:2005.8
The synthesis of three novel pyrazolo[60]fullerene derivatives containing electron-withdrawing substituents has been described. High solubility in ordinary organic solvents was proved. Their electrochemical properties of pyrazolo[60]fullerenes showed better electron affinity than pristine C60 in the ground state. The nanosecond transient absorption spectra showed clear evidence for photoinduced electron transfer from TTF to the excited triplet state of the pyrazolo[60]fullerenes, in which stronger electron-withdrawing substituents accelerate the rates of the photoinduced electron-transfer, indicating a high electron-acceptor ability of the excited triplet state of pyrazolo[60]fullerenes.