Solid‐state NMR study of a series of aminophosphonic acids

High‐resolution 31P, 15N and 13C NMR spectra have been obtained for nine solid aminophosphonic acids under conditions of high‐power decoupling, cross‐polarization and magic‐angle spinning. The NMR evidence shows that the asymmetric unit is a single molecule in all cases, which is consistent with the available diffraction studies. Phosphorus‐31 shielding tensor components determined from static and slow‐spinning MAS spectra are given for a number of the compounds.