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

Abstract

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.