The nuclear magnetic resonance absorption of hydrogens attached to nitrogen (^(14)N) may show sharp, broad or triplet lines. Single sharp lines are obtained with amines and ammonia where exchange is rapid. Broad lines (10-75 c.p.s. at 40 mc.) are observed for many amides and pyrrole, sharp triplet absorption has been observed for and completely anhydrous ammonia and ammonium ions in acid solution where N-H exchanges are slow. Triplet absorption is expected from spin-spin interactions between the protons and ^(14)N (I = 1).
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John D. Roberts (1956) studied this question.