SOLID-STATE C-13 NMR IMAGING WITH MAGIC-ANGLE-SPINNING

By synchronizing a rotating magnetic-field gradient with the rotation of a sample undergoing magic-angle spinning (MAS), solid-state C-13 NM R imaging has been carried out. Two-dimensional spatial-spatial C-13 N MR images have been demonstrated in natural abundance on organic solid s and a rigid polymer with and without chemical-shift selectivity. A 2 D spatial-spectral solid-state C-13 NMR image is also presented with M AS-enhanced spectral resolution in the chemical-shift dimension. It wa s found that the dependence of the C-13 Signal intensity on H-1 freque ncy offsets in H-1 decoupling is one of the major technical problems t hat must be minimized in order to perform useful solid-state C-13 NMR imaging. (C) 1995 Academic Press, Inc.