Photochemical reactivity in organized assemblies. 16. Intramicellar electron transfer quenching of excited states. Determination of the binding constant and exchange rates for dimethylviologen

1980 ◽  
Vol 102 (6) ◽  
pp. 1938-1941 ◽  
Author(s):  
Russell H. Schmehl ◽  
David G. Whitten
Keyword(s):  
Electron Transfer ◽  
Exchange Rates ◽  
Excited States ◽  
Binding Constant ◽  
Photochemical Reactivity ◽  
Organized Assemblies

scholarly journals Photophysical properties and electron transfer photochemical reactivity of substituted phthalimides

2020 ◽  
Vol 44 (40) ◽  
pp. 17252-17266
Author(s):  
Leo Mandić ◽  
Iva Džeba ◽  
Dijana Jadreško ◽  
Branka Mihaljević ◽  
László Biczók ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Photophysical Properties ◽  
Electron Donors ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Photochemical Reactivity

Substituents on phthalimide affect its photophysics and photochemical reactivity. Electron donors generally result in low quantum yields of intersystem crossing and reactivity from singlet excited states.

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

Determination of amide hydrogen exchange rates in peptides by mass spectrometry

1992 ◽  
Vol 64 (20) ◽  
pp. 2456-2458 ◽  
Author(s):  
Geraldine. Thevenon-Emeric ◽  
John. Kozlowski ◽  
Zhongqi. Zhang ◽  
David L. Smith
Keyword(s):  
Mass Spectrometry ◽  
Exchange Rates ◽  
Hydrogen Exchange ◽  
Amide Hydrogen ◽  
Amide Hydrogen Exchange
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