Investigation of some intramolecular hydrogen bonds by nitrogen magnetic resonance methods

It was shown that nitrogen NMR is a powerful tool in the studies of differe nt types of hydrogen bridges (NHN)(+), (NHN)(-), (NHN), and (NHO). Some of the NMR parameters, originally proposed by us, provide information about th e charge redistribution and the extent of proton transfer. The character of hydrogen bonds depend upon solvent, temperature and the physical phase. Th e results of studies in the solid state using the N-15 NMR CP MAS method we re also discussed.