MICROWAVE SPECTRA OF NITROGEN-CONTAINING MOLECULES .4. CONFORMATION, DIPOLE MOMENT, AND QUADRUPOLE COUPLING CONSTANTS OF CYCLOPROPYLAMINE

The microwave spectra of three isotopic species of cyclopropylamine have been investigated. The A, B, and C rotational constants in megahertz for C 3H6NH2 are, respectively, 16269.95, 6723.00, and 5795.33; for C3H5NHD they are 15957.12, 6382.01, and 5504.06; and for C3H5ND2 they are 15592.62, 6091.39, and 5246.56. Quadrupole coupling constants have been measured and have the values xaa=2.288, xbb= 1.841, and x cc=-4.129 MHz for the normal isotopic species. The dipole-moment components are found to be μa=0.43 D and μc= 1.11 D which lead to a total moment of 1.19 D. The molecular structure of cyclopropylamine has been discussed, and in addition to other structural parameters, we have found C-C = 1.520, C-N= 1.428, and amino H⋯H= 1.631 Å.