Bonding studies of compounds of boron and the Group 3–5 elements. Part XIII. He(I) photoelectron spectra of phosphines RnPX3–n(R = Me or But; X = H, Cl, or F; n= 1–3), (Me2N)nPCl3–n(n= 1–3), and (R2N)PF2(R = Me or Et)

Abstract
The He(I) photoelectron spectra of the title compounds have been measured. An empirical assignment of most of the bands is proposed and the effects of various substituents on the phosphorus lone-pair ionisation potentials are assessed. Correlations are made with various other parameters relating to phosphine basicity, and it is concluded that the phosphorus lone-pair i.p. provides a reasonable measure of relative basicity or σ-donor ability within related series of compounds.

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