Systematic Structural Investigations on Phosphines

Abstract

This work contributes to the systematic investigation of phosphines. In an attempt to determine the nature, shape, volume and direction of the lone pairs at the phosphorus atoms in phosphines, high resolution X-ray structure analyses of triphenylphosphine, tris(p-methoxyphenyl) phosphine, bis(2,4,6-triisopropylphenyl)phosphine, 1,1 -bis(diphenylphosphino)ethene and 4,5,6-triphenyl-4-phosphaspiro[2.4]hept-5-en have been carried out. New valence force field param eters (TRIPOS force field) are presented which were developed on the basis of the molecular structures of the free phosphines. The results of crystal growing experiments using zone melting techniques are summarized.