Abstract Dipolar relaxation of 15 N in anilines and anilinium ions is influenced by overall motion of the molecule, by rotation about the aryl–-nitrogen bond, by inversion of the aniline nitrogen and by interactions of the NH 2 or NH 3+ group with the solvent. These factors are assessed by comparison of the 13 C and 15 N dipolar relaxation times as a function of para- substitution on the aryl ring. In the anilines (solvent CDCl 3), electron withdrawal brings ...
