TRIS(DIALKYLAMINO)PHOSPHINE CHALCOGENIDE COMPLEXES OF TIN(IV) CHLORIDE: A MULTINUCLEAR (31P, 77Se, AND 119Sn) NMR CHARACTERIZATION

Four octahedral complexes of the type SnCl4 center dot 2L [L = (R2N)(3)P(E): E = Se; R = Me(1), Et(2) and E = S; R = Me(3), Et(4)] have been studied in solution by multinuclear (P-31, Se-77, and Sn-119) NMR spectroscopy. P-31 and Se-77 NMR data were informative of changes associated with complex formation. The solution structure of the complexes was confirmed by their Sn-119 NMR spectra that showed two triplet features for each complex, attributed to a mixture of the expected cis and trans isomers. The triplet signal is due to the coupling with two equivalent phosphorus atoms, consistent with an octahedral geometry around the tin center. In addition, density functional theory (DFT)/B3LYP calculations have been carried out to support the interpretations of NMR data. The results are discussed and compared with those reported for related complexes.