The direct characterisation of iron porphyries from coal using paramagnetic shift effects on proton NMR spectra

Abstract
Iron porphyries isolated from a Colorado bituminous coal have been investigated, and in favourable cases identified [etiohaem III, and the three suites (2),(3),(4) of its monodealkylation products], by the study of the paramagnetically shifted 1H NMR spectra of the low spin iron(III) dicyanide complexes.
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