Electron transfer in the quenching of protonated triplet thionine and methylene blue by ground state thionine

1982 ◽  
Vol 18 (3) ◽  
pp. 197-209 ◽  
Author(s):  
Prashant V. Kamat ◽  
Norman N. Lichtin
Keyword(s):  
Methylene Blue ◽  
Electron Transfer ◽  
Ground State

scholarly journals A carbon membrane-mediated CdSe and TiO2 nanofiber film for enhanced photoelectrochemical degradation of methylene blue

RSC Advances ◽  
2021 ◽  
Vol 11 (20) ◽  
pp. 11872-11881
Author(s):  
Xinye Zhang ◽  
Xueyue Zhang ◽  
Keting Feng ◽  
Xiaoyun Hu ◽  
Jun Fan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Electron Transfer ◽  
Carbon Membrane ◽  
Carrier Transfer ◽  
Tio2 Nanofiber ◽  
Transfer Channel ◽  
Nanofiber Film ◽  
Degradation Ability

A CdSe/C/TiO2 nanofiber film was prepared for enhanced photoelectrochemical degradation ability, and carbon membrane as a carrier-transfer-channel could promote electron transfer.

Perturbed ground state method for electron transfer

1999 ◽  
Vol 111 (17) ◽  
pp. 7818-7827 ◽  
Author(s):  
Oleg V. Prezhdo ◽  
James T. Kindt ◽  
John C. Tully
Keyword(s):  
Electron Transfer ◽  
Ground State ◽  
State Method

Redox Thermodynamics for Oxygen Species (O3, O2, HOO·, O2-, HOOH, HOO-, O, O-, and HO-); Effects of Media and pH

1992 ◽  
Author(s):  
Donald T. Sawyer ◽  
R. J. P. Williams
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Oxygen Atom ◽  
Ground State ◽  
Energy Transduction ◽  
Oxygen Species ◽  
Oxygen Atom Transfer ◽  
Green Plants ◽  
Redox Thermodynamics ◽  
Effects Of Media

Biological systems activate ground-state dioxygen (3O2) for controlled energy transduction and chemical syntheses via electron-transfer and hydrogen-atomtransfer reduction to O2-, HOO·, and HOOH. These reduction products are further activated with metalloproteins to accomplish oxygen atom-transfer chemistry. Conversely, green plants via photosystem II facilitate the oxidation of chemistry.

scholarly journals Halogen-Bond Assisted Photoinduced Electron Transfer

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4361
Author(s):  
Bogdan Dereka ◽  
Ina Fureraj ◽  
Arnulf Rosspeintner ◽  
Eric Vauthey
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Ground State ◽  
Halogen Bond ◽  
Quenching Rate ◽  
Excited Complex ◽  
Diffusion Controlled ◽  
Donor Acceptor ◽  
Quenching Rate Constant ◽  
Excited State Population

The formation of a halogen-bond (XB) complex in the excited state was recently reported with a quadrupolar acceptor–donor–acceptor dye in two iodine-based liquids (J. Phys. Chem. Lett. 2017, 8, 3927–3932). The ultrafast decay of this excited complex to the ground state was ascribed to an electron transfer quenching by the XB donors. We examined the mechanism of this process by investigating the quenching dynamics of the dye in the S1 state using the same two iodo-compounds diluted in inert solvents. The results were compared with those obtained with a non-halogenated electron acceptor, fumaronitrile. Whereas quenching by fumaronitrile was found to be diffusion controlled, that by the two XB compounds is slower, despite a larger driving force for electron transfer. A Smoluchowski–Collins–Kimball analysis of the excited-state population decays reveals that both the intrinsic quenching rate constant and the quenching radius are significantly smaller with the XB compounds. These results point to much stronger orientational constraint for quenching with the XB compounds, indicating that electron transfer occurs upon formation of the halogen bond.

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