Photoinduced electron transfer from colloidal cadmium sulfide to methylviologen: a picosecond transient absorption study

1988 ◽  
Vol 92 (2) ◽  
pp. 255-256 ◽  
Author(s):  
Yoshio Nosaka ◽  
Hajime Miyama ◽  
Mamoru Terauchi ◽  
Takayoshi Kobayashi
Keyword(s):  
Electron Transfer ◽  
Cadmium Sulfide ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Absorption Study

scholarly journals Photoinduced electron transfer in cyclophane-bridged porphyrin-quinone molecules. A subpicosecond transient absorption study

1996 ◽  
Vol 100 (12) ◽  
pp. 2076-2080 ◽  
Author(s):  
F. Pöllinger ◽  
C. Musewald ◽  
H. Heitele ◽  
M. E. Michel-Beyerie ◽  
C. Anders ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Absorption Study

Efficient photoinduced electron transfer between C60/C70 and zinc octaethylporphyrin studied by nanosecond laser photolysis method

2000 ◽  
Vol 04 (06) ◽  
pp. 591-598 ◽  
Author(s):  
MOHAMED E. EL-KHOULY ◽  
MAMORU FUJITSUKA ◽  
OSAMU ITO
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Photoinduced Electron Transfer ◽  
Transfer Rate ◽  
Transient Absorption ◽  
Laser Light ◽  
Solvent Polarity ◽  
Nanosecond Laser ◽  
Electron Transfer Rate ◽  
Absorption Bands

Photoinduced electron-transfer processes between C 60 or C 70 and zinc octaethylporphyrin ( ZnOEP ) have been studied in polar solvents with the nanosecond laser flash photolysis method, observing the transient absorption spectra in the visible and near-IR regions. By the predominant excitation of ZnOEP with 532 nm laser light the transient absorption bands of 3 ZnOEP * decayed, accompanied by the appearance of the transient absorption bands of [Formula: see text] and [Formula: see text]. By the predominant excitation of C 60 and C 70 with 610 nm laser light the decays of [Formula: see text] and [Formula: see text] were observed, accompanied by the appearance of [Formula: see text] and [Formula: see text]. The electron transfer rate constants (k et ) and the quantum yields (Φ et ) of [Formula: see text] and [Formula: see text] formation via 3 ZnOEP * and [Formula: see text] or [Formula: see text] have been evaluated. These values increase with the solvent polarity; in polar benzonitrile these values are higher than for other porphyrins such as zinc tetraphenylporphyrin. The back electron transfer rate constants were evaluated from the decays of [Formula: see text] and [Formula: see text], which also show a solvent polarity dependence.

Photoinduced electron transfer in a supramolecular triad system composed of ferrocene-zinc porphyrin-pyridylnaphtha-lenediimide

2007 ◽  
Vol 11 (05) ◽  
pp. 368-374 ◽  
Author(s):  
Shunichi Fukuzumi ◽  
Yukiyasu Kashiwagi
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Transient Absorption ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Zinc Ion ◽  
Transient Absorption Spectrum ◽  
Zinc Porphyrin ◽  
Long Lifetime ◽  
Porphyrin Moiety

A supramolecular ferrocene-zinc porphyrin-pyridylnaphthalenediimide triad is formed by coordinating the pyridine entity of pyridylnaphthalenediimide with the zinc ion of a ferrocene-zinc porphyrin dyad in benzonitrile. The fluorescence of the zinc porphyrin moiety is efficiently quenched by photoinduced electron transfer from the singlet excited state of the zinc porphyrin moiety to the naphthalenediimide moiety. This is followed by subsequent electron transfer from the ferrocene moiety to the zinc porphyrin radical cation to produce the final charge-separated state, ferricenium ion-zinc porphyrin-naphthalenediimide radical anion, which is successfully detected as a transient absorption spectrum in the laser flash photolysis. The decay of the charge-separated state obeys first-order kinetics irrespective of the initial concentration of the charge-separated state to afford a long lifetime (320 μs). This is the first example of a supramolecular triad that has a long lifetime as compared with the charge-separated state lifetime of the component dyad.

Flavin Core as Electron Acceptor Component in a Zinc(II)-Phthalocyanine-Based Dyad

2008 ◽  
Vol 61 (4) ◽  
pp. 256 ◽  
Author(s):  
Andreas Gouloumis ◽  
G. M. Aminur Rahman ◽  
Julia Abel ◽  
Gema de la Torre ◽  
Purificación Vázquez ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Ground State ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Significant Interaction ◽  
Transient Absorption ◽  
Cross Coupling ◽  
Ion Pair ◽  
Donor Acceptor ◽  
Recombination Dynamics

A zinc(ii)-phthalocyanine-flavin dyad has been synthesized by Heck-type cross-coupling between a flavin that bears a p-iodophenyl group and a phthalocyanine functionalized with a vinyl moiety. Electrochemical experiments reveal that no significant interaction occurs at the ground state between the two electroactive subunits. However, the occurrence of a photoinduced electron transfer in this donor–acceptor conjugate is observed in transient absorption experiments. Charge-separation (i.e., 4.0 × 1011 s–1) and charge-recombination dynamics in benzonitrile (2.2 × 1010 s–1) reveal a remarkable stabilization of the radical ion pair in this solvent.

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.

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