Low frequency infrared spectral studies on some of the molecular addition compounds of tin(IV) halides with triphenylphosphine and triphenylarsine

Abstract

Molecular addition compounds of tin tetrahalides with triphenylphosphine and triphenylarsine have been prepared. The analytical results show that triphenylphosphine forms both 1:2 (SnX₄.2L) and 1:1 (SnX₄.L) adducts (L=ligand), whereas triphenylarsine forms only 1:2 adducts. The effect of addition of these ligands on the ν(Sn−X) (where X=Cl, Br) of the Lewis acids has been studied. In all cases, νd(Sn−X) have been found to shift to a lower frequency region on coordination. Tentative assignments for ν(Sn−Y) (where Y=P, As) have been discussed on the basis of the experimental results.