Quenching of the singlet excited states of meso-substituted porphines by p-benzoquinone under unimolecular and bimolecular conditions: evidence for electron transfer in competition with vibrational relaxation

1982 ◽  
Vol 104 (1) ◽  
pp. 253-259 ◽  
Author(s):  
M. A. Bergkamp ◽  
J. Dalton ◽  
T. L. Netzel
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Vibrational Relaxation

Dynamics of intermolecular electron transfer from amines to the excited states of 9-fluorenone

2013 ◽  
Vol 264 ◽  
pp. 1-11 ◽  
Author(s):  
Vaishali Samant ◽  
Mahendra Varne ◽  
Dipak K. Palit
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Intermolecular Electron Transfer

Excited states of analogue models of M-bacteriochlorophylls (M = Mg, Zn) in the photosynthetic reaction center: a time-dependent density functional theory study

2002 ◽  
Vol 06 (10) ◽  
pp. 617-625 ◽  
Author(s):  
Yoichi Yamaguchi
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Density Functional ◽  
Photosynthetic Reaction Center ◽  
Excited Electron ◽  
Time Dependent ◽  
Analogue Model ◽  
Functional Theory ◽  
Special Pair ◽  
Dependent Density

Using time-dependent density functional theory (TDDFT), the excited states of the analogue model Mg -bacteriochlorophyll b - imidazole ( BChl -Im) dimer (P) for a special pair in the photosynthetic reaction center (RC) of Rhodopseudomonas (Rps.) viridis were examined. The calculated low-lying excited states and optimal geometries are in good agreement with experimental data. The order of the lowest unoccupied molecular orbital (LUMO) energies of P, the monomeric "accessory" BChl -Im (B), and bacteriopheophytin b ( H ) indicates the possibility of the light-induced electron transfer from P to H via B. The Im ligand of B destabilizes Goutermann's four-orbitals of BChl by 0.3-0.4 eV. With no energetic difference in the LUMOs between H and BChl , the Im ligands of P and B play an important role in providing a greater energetic gradient to the LUMOs along with the pathway for the excited-electron transfer in RC, resulting in the reduced reverse electron transfer from H to P (via B). Thus it is expected that the asymmetric Mg -Im interactions will directly affect the pathway of the excited-electron transfer. Using the deformed heterodimer (P') formed by the BChl halves with and without Im as the primary donor model, its cation radical P'+ was calculated as to whether the experimental asymmetric spin-density distribution can reproduce. The excited states of the analogue model Zn - BChl -Im dimer for a special pair in RC of the recently discovered Acidiphilium rubrum were also examined for a comparison with P.

A Unified Electron Transfer Model for the Different Precursors and Excited States of the Hydrated Electron

2001 ◽  
Vol 105 (37) ◽  
pp. 8434-8439 ◽  
Author(s):  
Tak W. Kee ◽  
Dong Hee Son ◽  
Patanjali Kambhampati ◽  
Paul F. Barbara
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Hydrated Electron ◽  
Transfer Model

REACTIVITY OF EXCITED STATES OF FLAVIN AND 5-DEAZAFLAVIN IN ELECTRON TRANSFER REACTIONS

1981 ◽  
Vol 33 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Rainer Traber ◽  
Ekehardt Vogelmann ◽  
Siegfried Schreiner ◽  
Tilmann Werner ◽  
Horst E. A. Kramer
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Transfer Reactions ◽  
Electron Transfer Reactions

Rapid Degradation of Rhodamine B over Cyclodextrin Modified TiO2

2011 ◽  
Vol 694 ◽  
pp. 764-768
Author(s):  
Xu Zhang ◽  
Nan Sheng Deng
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Rhodamine B ◽  
Self Assembly ◽  
Initial Rate ◽  
Solar Irradiation ◽  
Pollutant Degradation ◽  
Rapid Degradation ◽  
Hybrid Nanomaterial ◽  
Simulated Solar Irradiation

A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

Excited states and electron transfer reactions of C60(OH)18in aqueous solution

1998 ◽  
Vol 94 (3) ◽  
pp. 359-363 ◽  
Author(s):  
Hari Mohan ◽  
D. K. Palit ◽  
Jai P. Mittal ◽  
L. Y. Chiang ◽  
Klaus-Dieter Asmus ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Excited States ◽  
Transfer Reactions ◽  
Electron Transfer Reactions
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