TY - JOUR
T1 - Photoinduced electron transfer processes in rotaxanes containing [60]fullerene and ferrocene
T2 - Effect of axle charge on light-induced molecular motion
AU - Sandanayaka, Atula S.D.
AU - Sasabe, Hisahiro
AU - Araki, Yasuyuki
AU - Kihara, Nobuhiro
AU - Furusho, Yoshio
AU - Takata, Toshikazu
AU - Ito, Osamu
N1 - Funding Information:
This present work was supported by a Grants-in-Aid on Scientific Research on Priority Areas (417) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2006
Y1 - 2006
N2 - Two rotaxanes containing [60]fullerene (C60) as pendants on a crown-ether necklace, to which ferrocene (Fc) as axle stoppers were added, have been synthesized. One rotaxane has an ammonium cation in the centre of the axle (C60;Fc)Rot+ and the other has a neutral axle (C 60;Fc)Rot. Optimized structures, calculated using a molecular orbital method, suggest that in the ground states (C 60;Fc)Rot+ has a shorter distance between C60 and Fc than that of (C60;Fc)Rot. In both rotaxanes, efficient intra-rotaxane photoinduced electron-transfer processes have been observed by the selective excitation of C60 which acts as a photosensitized electron acceptor. The rates and efficiencies of the charge-separation and charge-recombination processes were evaluated by time-resolved fluorescence and transient absorption measurements with changing solvent polarity. From the different kinetic parameters between (C 60;Fc)Rot+ and (C60;Fc)Rot, the light-induced molecular motions of these rotaxanes in the excited states and charge-separated states were separately revealed.
AB - Two rotaxanes containing [60]fullerene (C60) as pendants on a crown-ether necklace, to which ferrocene (Fc) as axle stoppers were added, have been synthesized. One rotaxane has an ammonium cation in the centre of the axle (C60;Fc)Rot+ and the other has a neutral axle (C 60;Fc)Rot. Optimized structures, calculated using a molecular orbital method, suggest that in the ground states (C 60;Fc)Rot+ has a shorter distance between C60 and Fc than that of (C60;Fc)Rot. In both rotaxanes, efficient intra-rotaxane photoinduced electron-transfer processes have been observed by the selective excitation of C60 which acts as a photosensitized electron acceptor. The rates and efficiencies of the charge-separation and charge-recombination processes were evaluated by time-resolved fluorescence and transient absorption measurements with changing solvent polarity. From the different kinetic parameters between (C 60;Fc)Rot+ and (C60;Fc)Rot, the light-induced molecular motions of these rotaxanes in the excited states and charge-separated states were separately revealed.
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U2 - 10.1071/CH05311
DO - 10.1071/CH05311
M3 - Article
AN - SCOPUS:33645244276
VL - 59
SP - 186
EP - 192
JO - Australian Journal of Chemistry
JF - Australian Journal of Chemistry
SN - 0004-9425
IS - 3
ER -