Microwave Spectrum and Structure of Benzonitrile

Abstract

The rotational spectrum of benzonitrile has been studied in the one‐centimeter region, and approximately twenty absorption lines have been fitted to the rigid asymmetric‐rotor theory. The principal moments of inertia are 89.370, 326.740, and 416.183 AUA². The evidence indicates a planar symmetric structure with ring dimensions essentially the same as in benzene. The dipole moment is 4.14±0.05 Debye units.