AMINO INVERSION VIBRATION IN AMINOPYRIDINES

The far i.r. vapour phase spectra of aminopyridines are dominated by lines due to transitions in the inversion vibration of the amino group. The spectra of 2-, 3- and 4-aminopyridine and mono- and di-deuterated 2-aminopyridine between 50 and 665 cm-1 are reported. The barriers to inversion were determined and are shown to correlate extremely well with the calculated electron density on the amino nitrogen but less well with the dihedral angle between the ring and amino group planes. © 1979.