scholarly journals Photoactivation of the flavin cofactor in Xenopus laevis (6-4) photolyase: Observation of a transient tyrosyl radical by time-resolved electron paramagnetic resonance

2002 ◽  
Vol 99 (3) ◽  
pp. 1319-1322 ◽  
Author(s):  
S. Weber ◽  
C. W. M. Kay ◽  
H. Mogling ◽  
K. Mobius ◽  
K. Hitomi ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Xenopus Laevis ◽  
Tyrosyl Radical ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Electron Paramagnetic

scholarly journals Copper Complexes of Benzoylacetone Bis-Thiosemicarbazones: Metal and Ligand Based Redox Reactivity

2021 ◽  
Vol 74 (1) ◽  
pp. 34 ◽  
Author(s):  
Jessica K. Bilyj ◽  
Jeffrey R. Harmer ◽  
Paul V. Bernhardt
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Cyclic Voltammetry ◽  
Copper Complexes ◽  
Atmospheric Oxygen ◽  
The Other ◽  
Oxidation Reactions ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Vis Spectroscopy ◽  
Electron Paramagnetic

Bis-thiosemicarbazones derived from the β-diketone benzoylacetone (H3banR, R=Me, Et, Ph) are potentially tetradentate N2S2 ligands whose coordination chemistry with copper is reported. In the absence of oxygen and in the presence of base they form anionic CuII complexes of the fully deprotonated ligands [CuII(banR)]–. Upon exposure to atmospheric oxygen they undergo a complex series of reactions leading to two types of products; one a ligand oxidised ketone complex [CuII(banRO)] and the other an unprecedented dimeric di-CuIII complex [(CuIII(banR))2] depending on the R substituent. Time-resolved UV-vis spectroscopy, cyclic voltammetry, spectroelectrochemistry, and electron paramagnetic resonance (EPR) spectroscopy have been used to identify intermediates on the way to stable products formed under both anaerobic and aerobic conditions. It is found that both ligand-centred and Cu-centred oxidation reactions are occurring in parallel leading to this unusually complicated mixture of products.

W-Band Time-Resolved Electron Paramagnetic Resonance Study of Light-Induced Spin Dynamics in Copper–Nitroxide-Based Switchable Molecular Magnets

2012 ◽  
Vol 134 (39) ◽  
pp. 16319-16326 ◽  
Author(s):  
Matvey V. Fedin ◽  
Elena G. Bagryanskaya ◽  
Hideto Matsuoka ◽  
Seigo Yamauchi ◽  
Sergey L. Veber ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Spin Dynamics ◽  
Electron Paramagnetic Resonance Study ◽  
Molecular Magnets ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
W Band ◽  
Electron Paramagnetic
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