The conformational potential function for cyclopropylamine has been calculated from far-infrared spectra of gaseous cyclopropylamine-d0 and cyclopropylamine-d2. The spectrum of the -d2 molecule is much simpler to interpret because the substate splitting for the gauche conformer is smaller. The asymmetric potential function has been calculated with an enthalpy difference of 699 cm"1 (2.00 kcal/mol) between the more stable trans and the high-energy gauche conformers for the -d2 molecule; the trans/gauche barrier is similar to that of isopropylamine. Quantities determined in this study are compared with those calculated from the theoretical study of the structure and bonding of this molecule. Mid-infrared (3200-500 cm'1) spectra of the vapor and Raman spectra (3400-10 cm"1) of fluid cyclopropylamine-d2 have also been recorded and a vibrational assignment is proposed. These results are compared with the similar data for the -d0 molecule.

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