A MAS NMR METHOD FOR MEASURING C-13-O-17 DISTANCES

Results of C-13,O-17-rotational-echo, double-resonance NMR (REDOR) and C-13,O-17-rotational-echo, adiabatic-passage, double-resonance NMR (R EAPDOR) experiments on asparagine monohydrate are reported. The measur ement of carbon-oxygen distances in a solid sample with magic-angle sp inning NMR and O-17-enriched water is illustrated. These results show that determining the relative location of bound water in solids is pos sible and suggest that measuring distances between spin-1/2 nuclei and other chemical types of oxygen is feasible.