ENDOR study of nitrogen hyperfine and quadrupole tensors in vanadyl porphyrins of heavy crude oil
I.N. Gracheva, M.R. Gafurov, G.V Mamin, T.B. Biktagirov, A.A., Rodionov, A.V. Galukhin, S.B. Orlinskii
TL;DR
This study uses ENDOR spectroscopy to analyze nitrogen hyperfine and quadrupole interactions in vanadyl porphyrins within heavy crude oil, providing detailed experimental and theoretical insights into their electronic structure.
Contribution
It offers the first detailed characterization of nitrogen hyperfine and quadrupole tensors in vanadyl porphyrins in crude oil using ENDOR spectroscopy.
Findings
Identification of nitrogen hyperfine interactions in vanadyl complexes
Detailed tensor parameters for nitrogen quadrupole interactions
Enhanced understanding of vanadyl porphyrin electronic structure
Abstract
We report the observation of pulsed electron-nuclear double resonance (ENDOR) spectrum caused by interactions of the nitrogen nuclei 14N with the unpaired electron of the paramagnetic vanadyl complexes VO2+ of vanadyl porphyrins in natural crude oil. We provide detailed experimental and theoretical characterization of the nitrogen hyperfine and quadrupole tensors.
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Taxonomy
TopicsPetroleum Processing and Analysis · NMR spectroscopy and applications · Hydrocarbon exploration and reservoir analysis