Microwave Spectrum and Structure of Difluoramine

The microwave spectra of NF2H and NF2D have been analyzed. Rotational constants are 53 017.12, 10 895.43, 9307.22 Mc for NF2H, and 44 884.92, 10 749.38, 9 126.26 Mc for NF2D. The structure obtained from these constants is: rNF=1.400±0.002 Å, rNH=1.026±0.002 Å, ∠FNF=102.9°±0.2°, and ∠HNF=99.8°±0.2°. Quadrupole coupling constants have been measured for both isotopic species and the complete field-gradient tensor has been determined. The dipole moment has a magnitude of 1.93±0.02 D and makes an angle of 19° with the NH bond. An upper limit of 0.2 Mc may be set on the inversion splitting in the ground state.