Tris(dialkylamino)phosphine Chalcogenide Complexes of Tin(IV) Chloride: A Multinuclear (³¹P,⁷⁷Se, and¹¹⁹Sn) NMR Characterization

Abstract

Four octahedral complexes of the type SnCl 4 .2L [L = (R 2 N) 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 ( 31 P, 77 Se, and 119 Sn) NMR spectroscopy. 31 P and 77 Se NMR data were informative of changes associated with complex formation. The solution structure of the complexes was confirmed by their 119 Sn 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