Photoinduced Electron Transfer, Decarboxylation, and Radical Fragmentation of Cysteine Derivatives:  A Chemically Induced Dynamic Nuclear Polarization Study

1996 ◽  
Vol 118 (12) ◽  
pp. 2882-2891 ◽  
Author(s):  
Martin Goez ◽  
Jaroslaw Rozwadowski ◽  
Bronislaw Marciniak
Keyword(s):  
Electron Transfer ◽  
Dynamic Nuclear Polarization ◽  
Photoinduced Electron Transfer ◽  
Nuclear Polarization ◽  
Polarization Study ◽  
Chemically Induced ◽  
Radical Fragmentation

scholarly journals Electron self-exchange activation parameters of diethyl sulfide and tetrahydrothiophene

2013 ◽  
Vol 9 ◽  
pp. 1448-1454
Author(s):  
Martin Goez ◽  
Martin Vogtherr
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Nuclear Polarization ◽  
Activation Barrier ◽  
Activation Parameters ◽  
Radical Cations ◽  
Free Energies ◽  
Time Resolved ◽  
Diethyl Sulfide ◽  
Chemically Induced

Electron transfer between the title compounds and their radical cations, which were generated by photoinduced electron transfer from the sulfides to excited 2,4,6-triphenylpyrylium cations, was investigated by time-resolved measurements of chemically induced dynamic nuclear polarization (CIDNP) in acetonitrile. The strongly negative activation entropies provide evidence for an associative–dissociative electron exchange involving dimeric radical cations. Despite this mechanistic complication, the free energies of activation were found to be well reproduced by the Marcus theory of electron transfer, with the activation barrier still dominated by solvent reorganization.

Kinetic Evidence for Transiently Shifted Acidity Constant of Histidine Linked to Paramagnetic Tyrosine Probed by Intramolecular Electron Transfer in Oxidized Peptides

2021 ◽  
Author(s):  
Olga B. Morozova ◽  
Dmitri Stass ◽  
Alexandra V. Yurkovskaya
Keyword(s):  
Electron Transfer ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Intramolecular Electron Transfer ◽  
Acidity Constant ◽  
Time Resolved ◽  
Chemically Induced ◽  
Kinetics Of

Kinetics of electron transfer (ET) from tyrosine (Tyr) to short-lived histidine (His) radicals in peptides of different structures was monitored using time-resolved chemically induced dynamic nuclear polarization (CIDNP) to follow...

Sign in / Sign up

Export Citation Format

Share Document