GAS-PHASE REACTIONS OF H3PF2 - SYNTHESIS OF THE MONOHALOGENOPHOSPHANES H2PF AND H2PCL

Gas phase reactions of H3PF2 at less-than-or-equal-to 10 mbar with hyd rides (B2H6, HSi(CH3)3, HSn(CH3)3), amines (H3N, N(CH3)3) and electrop hilic halides of B, Si and Ti in the beam of an IR interferometer have been investigated with a time delay of 15 sec. between successive mea surements. Gas/solid phase reactions of H3PF2 with KF and AlCl3 and re actions of H2PF3 and HPF, have been studied similarly. With H3N, N(CH3 ), and electrophilic halides, H3PF2 was converted into its dehydrofluo rination product H2PF. This eliminates further HF in the presence of H 3N or N(CH3)3, while BCl3 or TiCl4 yield the hitherto unknown H2PCl. T he IR spectra of the short-lived species H2PF and H2PCI as well as the ir deuterated isotopomers, which reveal at room temperature and less-t han-or-equal-to 10 mbar a halflife time of less-than-or-equal-to 12 mi n. and less-than-or-equal-to 50 sec. respectively, were recorded and a nalysed in order to characterize the novel species.