Microwave spectrum of 2-aminopyridine
Kydd, R. A. and Mills, I. (1972) Microwave spectrum of 2-aminopyridine. Journal of Molecular Spectroscopy, 42 (2). pp. 320-326. ISSN 0022-2852
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To link to this article DOI: 10.1016/0022-2852(72)90087-2
The microwave spectra of 2-aminopyridine-NH2, -ND2, and of both of the two possible -NHD molecules have been observed and assigned in the 0+ vibrational state of the amino group inversion vibration; the assignment for three of the molecules in the 0− state is also made. From intensity measurements the 0+-0− splitting is estimated to be 135 ± 25 cm−1 for the -NH2 molecule and 95 ± 30 cm−1 for the -ND2 molecule. The rotational constants are interpreted in terms of a structure in which the amino group is bent about 32° out of the molecular plane, the c coordinates of the two amino H atoms being 0.21 and 0.28 Å. Stark effect measurements give a dipole moment of about 0.9 D which is almost entirely in the b axis, and which changes quite significantly between the 0+ and 0− states.