Dipole Moment Studies. VII. Dipole Moments of the Halofluorophosphines

Abstract

Dipole moment measurements have been made on a series of halophosphines using gas phase heterodyne beat methods. Values obtained are: PF3, 1.00±0.03 D; PF2Cl, 0.93±0.01 D; PFCl2, 0.86±0.05 D; PF2Br, 0.83±0.05 D; and PF2I, 0.85±0.06 D. The value for PF3 is in reasonable agreement with the microwave value [R. G. Schulman et al., Phys. Rev. 78, 145 (1950)], of 1.025±0.009 D. Molecular moments for the mixed halophosphines are approximated reasonably well by the vector sum of P-X moments, but the value for PF2H cannot be estimated in this way. An explanation is offered in terms of a polarization model.