STUDIES OF MODEL ORGANIC AND INORGANIC-COMPOUNDS BY N-15 CP MAS NMR USING INVERSION-RECOVERY CROSS-POLARIZATION

($) under bar In this paper, a study of simple organic/inorganic compo unds by N-15 and C-13 CP MAS NMR using a selective sequence (Inversion Recovery Cross Polarization, IRCP) is presented. Such a sequence allo ws a precise insight in the CP dynamic of various (15)(N) under bar H- x (x = 0 --> 4) sites. It allows also the selection of the different N MR lines according to the number of directly bonded protons. This tech nique appears extremely useful for the study of inorganic polymerisati on, starting from protonated precursors (borazines) and leading to non -protonated boron nitride (BN) phases.