Far-Ir Study of Tin Tetrahalide Diphosphine Adducts

Abstract

Thirteen tin tetrahalide diphoshine adducts of the general formula cis-SnX₄. (L-L), X = Cl, Br, I; L-L = DPPE (Ph₂ P CH₂ CH₂ PPh₂), DMPE (Me₂ P CH₂ CH₂ P Me₂), DMPP (Me₂ P CH₂ CH₂ CH₂ P Me₂), DEPE (Et₂ P CH₂ CH₂ P Et₂), DEPP (Et₂ P CH₂ CH₂ CH₂ PEt₂), twelve of which are reported for the first time in this work, have been synthesized and their far-ir spectra in the 400–40 cm⁻¹ region have been investigated. The vibrations in the 295–310 cm⁻¹, 208–210 cm⁻¹ and 156–185 cm⁻¹ regions were attributed to Sn - X strectching vibrations of chloro, bromo and iodo adducts, respectively, and the vibrations in the 100–116 cm⁻¹ region were attributed to the Sn - P stretching vibrations for the twelve adducts investigated. The weak vibrations in the lower frequency region were evaluated as skeletal bending vibrations.