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Motions of Ethylammonium Ions in Solid Ethylammonium Chloranilate Studied by 1H Nuclear Magnetic Resonance

Abstract The motions of the ethylammonium ion in solid ethylammonium chloranilate, C2H5NH+3 • C6HO4CI-2, are studied by 1H NMR second moment (M2) and spin-lattice relaxation time {T1) measurements. Re orientations of the CH3 group about the C-C bond axis and the NH+3 group about C -N bond axis were observed and their motional parameters were evaluated. The internal rotational barriers of the CH3 and NH+3 groups of an isolated C2H5NH+3 ion were estimated from ab initio molecular orbital calculations.