Heteronuclear magnetic double resonance: spin–spin couplings involving nitrogen-14

Abstract

The reduced coupling constant between nitrogen and carbon connected by a single bond in methyl isocyanide is found to be positive in agreement with theory. The signs of the geminal and vicinal couplings between ¹H and ¹⁴N in isocyanides are shown to be negative and positive respectively, and the vicinal ¹⁴N⋯¹H coupling constant in the tetraethylammonium cation is found to be positive.