Intermolecular Magnetic Spin–Spin Interactions in Solution State at 1.53 mT

Abstract

Overhauser dynamic nuclear polarization (DNP) technique can provide a dramatic increase in the signal obtained from nuclear magnetic resonance experiments owing to the magnetic spin–spin interactions between ¹H nuclei of the solvent and electrons delocalized on the asphaltene in crude petroleum or asphalt. Studies on ¹H Overhauser DNP enhancements at 1.53 mT are reported for benzene solvent medium with three different radical sources: Iran crude petroleum, MC30 liquid asphalt, and MC800 liquid asphalt for a range of radical concentrations. The results show that protons of benzene are good detectors for dipolar coupling.

GRAPHICAL ABSTRACT

Keywords:

• Asphalt
• asphaltene crude petroleum
• benzene
• dynamic nuclear polarization
• proton–electron double resonance

Notes

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