STRUCTURAL MODIFICATIONS OF VO2+ CHELATES IN THE ORGANIC MATTER OF OILS AND BITUMENS FROM THE EPR SPECTRA
L. G. Gilinskaya1, L. S. Borisova2, E. A. Kostyreva2
1Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Trofimuk Institute of Petroleum-Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: vanadyl ion complexes, EPR spectra, simulation of superimposed spectra
Abstract
Vanadyl metal-organic complexes (VO2+) in genetically different fractions of natural oils and bitumens are studied using EPR. Phenolic vanadyl complexes are identified having an isotropic spectrum with the parameters Ao = 8.82 mT, go = 1.996, as opposed to the previously studied axially symmetric spectra of vanadyl porphyrin complexes with Ao = 9.46 mT, go = 1.976 ( A|| = 16.79 mT, A⊥ = 5.78 mT, g|| = 1.964, g⊥ = 1.983). The simultaneous presence of both types of vanadyl complexes in the samples under consideration results in a complex spectrum, which is identified by computer simulation using the ESR1 software.
DOI: http://dx.doi.org/10.1134/S0022476615030051
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