Mn2+ EPR spectroscopy for the provenance study of natural carbonates

Author(s):  
Octavian G. Duliu ◽  
Vasile Bercu ◽  
Daniel C. Negut
1963 ◽  
Vol 36 (3_4) ◽  
pp. 247-248
Author(s):  
H. Dreeskamp
Keyword(s):  

2016 ◽  
Author(s):  
Juan Carlos Guerrero ◽  
◽  
Achim D. Herrmann ◽  
John T. Haynes

2016 ◽  
Author(s):  
Carsyn Ames ◽  
◽  
Andrew Leier ◽  
Dale A. Leckie ◽  
John Chesley ◽  
...  

2019 ◽  
Author(s):  
Emma D.L. Kroeger ◽  
◽  
Maurice Colpron ◽  
Stephen J. Piercey ◽  
William C. McClelland ◽  
...  

1980 ◽  
Vol 45 (6) ◽  
pp. 1669-1676 ◽  
Author(s):  
Pavel Kubáček

The first step of electrochemical oxidation of 2-phenyl- and 2-(4-tolyl)-1,3,4,7-tetramethylisoindoles in anhydrous acetonitrile produces relatively stable cationradicals which have been studied by means of EPR spectroscopy using the method of internal electrochemical generation of radicals under reduced temperature. The same electrochemical behaviour of the both studied derivatives and identical EPR spectra of their cationradicals can be explained within the Huckel MO method. The largest contribution to the magnitude of splitting constant of nitrogen nucleus is due to π-σ-spin polarization of C-N bonds caused by high spin abundance of pz-AO of carbon atoms. Half-life of decomposition of the studied cationradicals is 4 min at -30°C.


1999 ◽  
Vol 64 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Gabriel Čík ◽  
František Šeršeň ◽  
Alena Bumbálová

The formation of reactive oxygen species due to irradiation by a visible light of the polythiophene deposited in ZSM-5 zeolite channels in aqueous medium has been studied. Polymerization of thiophene was carried out in zeolite channels after the ion-exchange reaction of Na+ for Fe3+. By means of EPR spectroscopy, the temporarily generated 1O2 in irradiated aqueous medium was proved. The formation of O2-• was confirmed by the reduction of Fe3+-cytochrome c. Irradiation led to the water reduction to hydrogen.


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