Tin Tetrahalide Complexes with Tetraethyl Propylenediphosphonate

Abstract

Tin-119 and phosphorus-31 NMR spectra have been recorded for three tin tetrahalide complexes with tetraethyl propylenediphosphonate SnX₄·L, where L = (EtO)₂P(O)CH₂ CHMeP(O) (OEt)₂, X = Cl(1); X = Br (2); X = I(3). Each complex exists in solution in the form of only one isomer with two different phosphoryl units coordinated at tin. The crystal structure of SnCl₄·L (1) has been determined. The complex has a monomeric 7-membered chelate structure with octahedral epvironment at tin. It crystallizes in the monoclinic space group P2₁/n with a = 9.531(2) Å, b = 16.556(3)Å, c = 14.634(3) Å, β = 98.73(3)°, Z = 4, d_calc = 1.678 Mg/m³, N_obs = 2813, R = 0.045