Abstract
A considerable body of information about the electron spin resonance (ESR) properties of petroleum asphaltenes has developed during the past few years.(1–3) Among the basic parameters obtained by ESR measurements are N g, the number of unpaired spins per gram of material; |A|, the electron-nuclear spin coupling constant; and g, the effective Landé g-factor for the unpaired electron spins. A review of what is already known, and the addition of new data, may both clarify the present state of understanding of asphaltene ESR and stimulate further research in this area. The ESR studies briefly considered here may be divided into two parts: (1) measurements of the free-radical absorption, and (2) measurements of the ESR absorptions due to naturally occurring vanadium and synthetic vanadium chelate model systems.
This work was sponsored by Gulf Research & Development Company as part of the research program of the Multiple Fellowship on Petroleum.
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Yen, T.F., Tynan, E.C., Vaughan, G.B., Boucher, L.J. (1970). Electron Spin Resonance Studies of Petroleum Asphaltics. In: Friedel, R.A. (eds) Spectrometry of Fuels. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-8121-1_14
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