TIN TETRAHALIDE COMPLEXES WITH TETRAETHYL PROPYLENEDIPHOSPHONATE

Tin-119 and phosphorus-31 NMR spectra have been recorded for three tin tetrahalide complexes with tetraethyl propylenediphosphonate SnX4 . L , where L = (EtO)(2)P(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 iso mer with two different phosphoryl units coordinated at tin. The crysta l structure of SnCl4 . L (1) has been determined. The complex has a mo nomeric 7-membered chelate structure with octahedral environment at ti n. It crystallizes in the monoclinic space group P2(1)/n with a=9.531( 2) Angstrom, b=16.556(3)Angstrom, c=14.634(3)Angstrom, beta=98.73(3)de grees, Z=4, d(calc) = 1.678 Mg/m(3), N-obs = 2813, R = 0.045.