MOLECULAR AND CRYSTAL STRUCTURE AND ELECTRON DENSITY DISTRIBUTION IN P-BIS(TRIMETHYLSILYL)AMINO-C,C-DICHLOROMETHYLENEPHOSPHINE

Abstract

Molecular and crystal structure of P-bis(trimethylsilyl)amino-C,C-dichloromethylenephosphine which is a liquid at ambient temperature (m.p. ∼ -9°C) was determined at - 120°C by the low-temperature X-ray diffraction method and deformation electron density maps were calculated. Experimental evidence is obtained for the conclusion that in P-aminosubstituted phosphaalkenes the n _N-π_P==C conjugation causes not only shortening of the single P-N bond through which this conjugation is transferred but also shortening of the P==C double bond. Comparison of peculiarities of electron density distribution is given for both highly conjugated and double-bond localized phosphaalkenes.

Key Words:

• Phospaalkenes
• X-ray
• conjugation
• electron-density
• distribution