Force constant calculations for pyramidal four-atom molecules—I The pyramidal XY3 molecules As(CH3)3, AsCl3 and AsBr3

Abstract

Using Wilson's FG matrix technique, general valence force constants and Urey—Bradley force constants of As(CH₃)₃, AsCl₃ and AsBr₃, all molecules of the type XY₃, have been calculated from published Raman data and structural parameters.

It appears however that the molecule As(CH₃)₃ cannot be approached by the Urey—Bradley force field. So the comparative study of the bonding characteristics is limited to the general valence force field data.