Gas-phase molecular structure of difluoro(isoselenocyanato)phosphine determined by electron diffraction

Abstract

The molecular geometry of PF₂(NCSe) has been investigated in the gas phase by electron diffraction. Mean amplitudes of vibration and perpendicular amplitude-correction coefficients have been derived from previously published spectroscopic data, and used to determine the average (r_α) structure. The principal parameters (r_α) for PF₂(NCSe) are: r(P–F) 153.0(4), r(P–N) 164.9(12), r(NC) 121.2(8), and r(CSe) 168.1(10) pm; angle P–N–C 149.0(15), F–P–N 98.8(8), and F–P–F 97.9(14)°. The overall symmetry is C_s with the pseudohalide group lying trans to the F–P–F angle bisector.