Abstract
The preparation and characterization of a series of octahedral complexes [SnF 4L 2] (L = (Me 2N) 3PO ( 1), L = (R 2N) 2P(O)F; R = Me ( 2); Et ( 3) or L = R 2NP(O)F 2; R = Me ( 4); Et ( 5)) are described. These new adducts have been characterised by multinuclear ( 19F, 31P and 119Sn) NMR, IR spectroscopy and elemental analysis. The NMR data particularly the 19F NMR spectra showed that the complexes exist in solution as mixtures of cis and trans isomers. The solution behaviour of the complexes studied by variable temperature NMR in the presence of excess ligand indicated that, unlike in the SnCl 4 analogues, the ligand exchange at room temperature is slow for 1– 3 and fast only for 4 and 5. The metal–ligand exchange barriers in [SnF 4L 2] and [SnCl 4L 2] systems were estimated and compared. The results indicate that in addition to the difference in the Lewis acidity between SnF 4 and SnCl 4 the nature of the substituents (fluorine atoms) on the phosphorus atom of the ligand can contribute considerably to the lability of the complex obtained.
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