Efficient Electron Transfer Processes of the Covalently Linked Perylenediimide−Ferrocene Systems: Femtosecond and Nanosecond Transient Absorption Studies

2010 ◽  
Vol 114 (24) ◽  
pp. 10969-10977 ◽  
Author(s):  
Mustafa Supur ◽  
Mohamed E. El-Khouly ◽  
Jai Han Seok ◽  
Jung Hoon Kim ◽  
Kwang-Yol Kay ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transient Absorption ◽  
Transfer Processes ◽  
Absorption Studies ◽  
Covalently Linked ◽  
Electron Transfer Processes

Direct observation of the photoinduced electron transfer processes of bis(4-arylphenylamino benzo)-ortho-carborane using transient absorption spectroscopic measurements

2017 ◽  
Vol 19 (36) ◽  
pp. 24485-24492 ◽  
Author(s):  
Mi Rang Son ◽  
Yang-Jin Cho ◽  
So-Yeon Kim ◽  
Ho-Jin Son ◽  
Dae Won Cho ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Direct Observation ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Absorption Measurement ◽  
Spectroscopic Measurements ◽  
Transfer Processes ◽  
Electron Transfer Processes

The characteristic Cb˙− and Ar˙+ species of ortho-carborane triads generated by the photoinduced electron transfer are investigated by transient absorption measurement.

Photoinduced electron transfer from triplet states of phthalocyanines to fullerenes studied by transient absorption spectroscopies in visible and near-IR regions

2000 ◽  
Vol 04 (08) ◽  
pp. 713-721 ◽  
Author(s):  
MOHAMED E. EL-KHOULY ◽  
SHAFIQUL D.-M. ISLAM ◽  
MAMORU FUJITSUKA ◽  
OSAMU ITO
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Triplet States ◽  
Absorption Bands ◽  
Polar Solvents ◽  
Transfer Processes ◽  
Near Ir ◽  
Electron Transfer Processes ◽  
Electron Ejection

Photoinduced electron transfer processes between C 60/ C 70 and phthalocyanines such as tetra-tert-butylphthalocyanine ( H 2 TBPc ) and its zinc derivative ( ZnTBPc ) in polar solvents have been studied by observing the transient absorption spectra in the visible and near-IR regions. Upon predominant excitation of TBPcs with a 670 nm laser pulse in polar solvents, growth of the transient absorption bands of [Formula: see text] and [Formula: see text] was observed, accompanied by a concurrent decay of the triplet states of TBPcs (3 TBPc *). Thus it is confirmed that electron transfer occurs via 3 TBPc * in polar solvents. The electron transfer rate constants and efficiencies of electron transfer via 3 ZnTBPc * are greater than those via 3 H 2 TBPc * owing to the electron ejection ability of 3 ZnTBPc *. Solvent effects on the forward and backward electron transfer processes have been evaluated.

Photoinduced Electron Transfer Processes in Rotaxanes Containing [60]Fullerene and Ferrocene: Effect of Axle Charge on Light-Induced Molecular Motion

2006 ◽  
Vol 59 (3) ◽  
pp. 186 ◽  
Author(s):  
Atula S. D. Sandanayaka ◽  
Hisahiro Sasabe ◽  
Yasuyuki Araki ◽  
Nobuhiro Kihara ◽  
Yoshio Furusho ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Solvent Polarity ◽  
Orbital Method ◽  
Time Resolved ◽  
Transfer Processes ◽  
Recombination Processes ◽  
Electron Transfer Processes ◽  
Absorption Measurements

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 (C60;Fc)Rot. Optimized structures, calculated using a molecular orbital method, suggest that in the ground states (C60;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 (C60;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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