Competition of singlet and triplet recombination of radical pairs in photoreactions of carboxy benzophenones and aromatic amino acids

2019 ◽  
Vol 21 (4) ◽  
pp. 2017-2028 ◽  
Author(s):  
Olga B. Morozova ◽  
Peter S. Sherin ◽  
Alexandra V. Yurkovskaya
Keyword(s):  
Amino Acids ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Transient Absorption ◽  
Branching Ratio ◽  
Aromatic Amino Acids ◽  
Radical Pairs ◽  
Time Resolved ◽  
Chemically Induced

Time-resolved chemically induced dynamic nuclear polarization and transient absorption were applied to reveal the branching ratio of the singlet and triplet recombination channels in the reaction of short-lived radicals of carboxy benzophenones and the aromatic amino acids.

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...

scholarly journals Photo-CIDNP in Solid State

2021 ◽  
Author(s):  
Jörg Matysik ◽  
Yonghong Ding ◽  
Yunmi Kim ◽  
Patrick Kurle ◽  
Alexandra Yurkovskaya ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Analytical Method ◽  
Nuclear Polarization ◽  
State Of The Art ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Radical Pairs ◽  
Chemically Induced ◽  
Angle Spinning

AbstractPhoto-CIDNP (photo-chemically induced dynamic nuclear polarization) refers to nuclear polarization created by the spin-chemical evolution of spin-correlated radical pairs (SCRPs). This phenomenon occurs in gases, liquids and solids. Based on the solid-state photo-CIDNP effect observed under magic-angle spinning (MAS), photo-CIDNP MAS NMR has been developed as analytical method. Here we report the origin, the theory and the state of the art of this method.

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