Preparation and properties of diaminodifluorophosphorane

Abstract

Diaminodifluorophosphorane, PF₂H(NH₂)₂, has been prepared by the reaction of chlorodifluorophosphine and ammonia, and has been characterised spectroscopically. Its vibrational spectra can be interpreted in terms of C_2ν symmetry, with a trigonal-bipyramidal structure with axial fluorine atoms. N.m.r. spectra are consistent with this structure, and show that the amino-groups rotate rapidly at room temperature, but are slowed on cooling. Signs and magnitudes of coupling constants far PF₂H(¹⁵NH₂)₂ are reported.