Nuclear magnetic resonance high resolution measurements of certain light hydrocarbon systems are described which illustrate the dependence of chemical shift on intermolecular interactions. Investigations of interaction phenomena are extended to a quantitative study of pure hydrocarbons in the petroleum oil range. Concentration dependent chemical shift deviation values as large as 27 sec−1 at a Larmor frequency of 40 Mc per sec are observed in n-hexadecane-diphenylmethane mixtures. The implication of these concentration dependent shifts on structural characterization of petroleum oils by reference standards is discussed.
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