Mössbauer parameters of adducts of tin(IV) halides with amines, nitriles, phosphines, and arsines

Abstract

Mössbauer parameters are reported for the adducts SnX₄,L (L = NMe₃, X = Cl or Br; L = PPh₃ or Ph₂PCH₂PPh₂, X = Cl) and SnX₄,2L (L = NMe₃, X = Cl, Br, or I; L = NEt₃; X = F; L = Py, PBuⁿ₃, AsPh₃, or AsEt₃, X = Cl or Br; L = MeCN, PhCN, PPh₃, PPh₂Me, PPhEt₂, or PEt₃, X = Cl). Variations in chemical shifts for the adducts are discussed in terms of s character of the bonds to tin. Of the nitrogen donors, only the nitriles give rise to resolved quadrupole splitting. Triphenyl-phosphine and -arsine adducts give single-line spectra but quadrupole splitting is induced by replacing phenyl groups by alkyl groups. The five-co-ordinate adducts SnCl₄,NMe₃ and SnBr₄,NMe₃ give narrow-line spectra which exhibit no quadrupole splitting. I.r. and Raman data in the range 400–100 cm.^–1 are reported for the 1 : 2 phosphine and arsine adducts. Attempts to prepare adducts of tin(IV) chloride and bromide with triphenylstibine resulted in reduction of the metal to tin(II).