Reaction of BF3 with NH3: Microwave spectrum of BF2NH2

Microwave spectra assignable to gas phase aminodifluoroborane (BF₂NH₂) have been detected in the reaction of BF₃ with NH₃. A centrifugal distortion analysis has been carried out on the species ¹¹BF₂ ¹⁴NH₂ and ¹⁰BF₂ ¹⁴NH₂. Distortion corrected rotational constants have also been obtained for ¹¹BF₂ ¹⁵NH₂, ¹⁰BF₂ ¹⁵NH₂, ¹¹BF₂ ¹⁴ND₂, and ¹⁰BF₂ ¹⁴ND₂. The molecule has been found to be planar with the following geometry: r_B–F = 1.325(12) A, r_B–N = 1.402(24) Å, r_N–H = 1.0029(18) Å, $\angle \mathrm{FBF}\text{=117.9(17)°}$ and $\angle \mathrm{HNH}\text{=116.94(30)°}$ . The observed dipole moment of BF₂NH₂ is μ=2.595(30) D.