Journal
ENERGIES
Volume 15, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/en15176204
Keywords
asphaltenes; electron paramagnetic resonance; vanadyl complexes; HYperfine Sublevel CORrelation Spectroscopy
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Funding
- RSF [21-73-30023]
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This study analyzed the electron-nuclear interactions of VP complexes in oil asphaltenes and investigated the complex hyperfine structure related to nuclear spins, providing insights into the transformation of asphaltenes.
The purpose of this work is to analyze the electron-nuclear interactions of the vanadyl-porphyrin (VP) complexes in oil asphaltenes. Asphaltenes from the Athabasca oil sands were studied by HYperfine Sublevel CORrelation Spectroscopy (HYSCORE) electron paramagnetic resonance (EPR). It makes it possible to resolve and interpret complex hyperfine spectra of intrinsic VP with strong and weak hyperfine interactions between the electron magnetic moment and various nuclear spins (H-1, N-14, V-51). The main parameters of spin-Hamiltonian for the VP spin system are determined. The axially symmetric structure of the VP complexes is revealed, and the local nuclear environment of the paramagnetic center is investigated. The results can be used for the study of asphaltene electron-nuclear structure and asphaltene aggregates with the aim of elucidating asphaltenes' transformation(s) under the influence of external treatment.
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