Results Obtained from the Analysis of the Microwave Spectrum of and ab initio Calculations on Phenylgermane.

Abstract The microwave spectra of four isotopomers of phenylgermane were investigated in the frequency range 12.4–26.5 GHz. Only the ground state spectra (e mj = 0) were assigned. The rotational constants (A) obtained have values which correspond to contributions only from the frame. At the same time, the inertial defects have nearly zero values. These are typical features of a nearly free six-fold barrier to internal rotation. A plausible structure, based on 4-21G * ab initio calculations, was obtained.