Tin(IV) Tetrachloride Complexes with Bis-(Dialkylamino)phosphoryl Fluoride: A Multinuclear (119Sn, 31P, 19F,and 1H) NMR Characterization in Solution |
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Authors: | M A M Khouna M T Ben Dhia M R Khaddar |
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Institution: | Laboratory of Coordination Chemistry, Department of Chemistry, University of Tunis El Manar , Tunis, Tunisia |
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Abstract: | The two octahedral complexes SnCl4·2(O)PF(NR2)2 (R = Me or Et) were prepared from reaction of SnCl4 with the ligand (R2N)2P(O)F in anhydrous CHCl3. The new adducts have been characterized by elemental analysis, IR, and multinuclear (119Sn, 31P, 19F, and 1H) NMR spectroscopy. The NMR data show that the adducts exist in solution as a mixture of cis and trans isomers with markedly different proportions. When compared with previously described hexamethylphosphoramide (HMPA) and trimethylphosphate (TMPA) analogues, our results indicate that the cis isomer is the predominant species in solution. Low temperature 31P and 119Sn NMR spectra show that the compounds partially dissociate in dichloromethane. |
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Keywords: | 31P NMR 119Sn NMR 119Sn-31P coupling constants phosphoryl ligands tin tetrachloride |
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