¹ H NMR STUDY OF SOLID ETHYLAMMONIUM AND PROPYLAMMONIUM NITRATES. CATION MOTIONS IN THE STABLE AND METASTABLE PHASES.

The **1H-NMR spin lattice relaxation times, T//1, were observed for ethylammonium nitrate, (CH//3CH//2NH//3)NO//3, and propylammoniumnitrate, (CH//3CH//2CH//2NH//3)NO//3, and for their partially deuterated analogs, (CH//3CH//2ND//3)NO//3, and CH//3(CH//2)//2ND//3NO//3, respectively. For each salt two solid phases were found, one of them being metastable and existing below ca. 200 K and ca. 210 K for the ethylammonium nitrate and propylammonium nitrate, respectively. The results of the T//1 measurements are consistent with the assumption that CH//3 and NH//3 group reorientations about their C-C and C-N bond axes take place in the stable and in the metastable phase of both salts.