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.