Tris(dialkylamino)phosphine Chalcogenide Complexes of Tin(IV) Chloride: A Multinuclear (³¹P, ⁷⁷Se, and ¹¹⁹Sn) NMR Characterization

Abstract

Four octahedral complexes of the type SnCl₄.2L [L = (R₂N)₃P(E): E = Se; R = Me(1), Et(2) and E = S; R = Me(3), Et(4)] have been studied in solution by multinuclear (³¹P, ⁷⁷Se, and ¹¹⁹Sn) NMR spectroscopy. ³¹P and ⁷⁷Se NMR data were informative of changes associated with complex formation. The solution structure of the complexes was confirmed by their ¹¹⁹Sn 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.

GRAPHICAL ABSTRACT

Keywords:

• Phosphine chalcogenide
• tin(IV) chloride
• 31P, 77Se, and 119Sn NMR
• 2JPSn coupling
• DFT/B3LYP

Acknowledgements

Dedicated to Professor M. R. Khaddar on the occasion of his retirement.

We are grateful to the Tunisian Ministry of High Education and Scientific Research for financial support (LR99ES14) of this research and to Professor Emeritus A. Baklouti of the Department of Chemistry, Faculty of Sciences of Tunis, University of Tunis El Manar for his valuable contribution and continuous support.