FAR-INFRARED OF THE LOCAL-ANESTHETIC PROCAINE

The low spectral region of procaine was studied by far-infrared spectr oscopy. Raman lines were registered and interpreted. An equivalent stu dy was performed on the molecule of benzocaine. In the characterizatio n of the bands, and in the description of the torsion-inversion mode o f the p-amino group, the AM1 semiempirical method was used. The optimu m geometry parameters, the torsion and inversion potential functions, the energy levels, and the transitions were obtained. The effects of t emperature on the torsion and inversion modes were studied.