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 C2ν 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.