Electron diffraction determination of the molecular structures of dimethylaminodifluorophosphine and aminodifluorophosphine in the gas phase

Abstract

The molecular structures of dimethylaminodifluorophosphine, Me₂NPF₂, and aminodifluorophosphine, H₂NPF₂, in the gas phase have been determined by the sector-microphotometer method of electron diffraction. The principal parameters for dimethylaminodifluorophosphine are: r(P–F) 1·589 ± 0·003, r(P–N) 1·684 ± 0·008, r(C–N) 1·448 ± 0·006 Å; P–N–C 118·3 ± 0·6°, and C–N–C 111·8 ± 1·5°; for aminodifluorophosphine r(P–F) 1·581 ± 0·003, and r(P–N) 1·661 ± 0·007 Å. The positions of the hydrogen atoms are not well defined, but the angles at nitrogen are probably close to those at nitrogen in the dimethyl compound. Both molecules adopt a staggered conformation.