HYSCORE Spectroscopy to Resolve Electron–Nuclear Structure of Vanadyl Porphyrins in Asphaltenes from the Athabasca Oil Sands In Situ Conditions

The purpose of this work is to analyze the electron–nuclear interactions vanadyl-porphyrin (VP) complexes in oil asphaltenes. Asphaltenes from Athabasca sands were studied by HYperfine Sublevel CORrelation Spectroscopy (HYSCORE) electron paramagnetic resonance (EPR). It makes it possible resolve and interpret complex hyperfine spectra intrinsic VP with strong weak between magnetic moment various nuclear spins (1H, 14N, 51V). main parameters spin-Hamiltonian for spin system are determined. axially symmetric structure revealed, local environment center investigated. results can be used study asphaltene aggregates aim elucidating asphaltenes’ transformation(s) under influence external treatment.