Knowledge Bank

The microwave spectra of dimethylaminodifluorophosphine-$d0$, $(CH3)2NPF$, and dimethylaminodifluorophosphine-$d3$ have been recorded from 26.5 to 39.0 GHz. The rotational spectra of five vibrational satellites in the $d0$ compound and the ground states in the two $d3$ compounds have been assigned and the rotational constants calculated. The determined structural parameters show that the molecule has a semiplanar configuration in which the phosphorus, nitrogen, and two carbons lie on the symmetry plane of the molecule. Additionally, analyses of the relative intensities of the series of excited states give a vibrational frequency of $35\to 10cm-1$ which is the $NC2$ out-of-plane wag.