Synthesis,spectroscopic and structural studies of 2,2,2-trifluoroethyl phosphorodiamidate complexes with tin(IV) chloride |
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| Authors: | MAMK Sanhoury MT Ben Dhia K Essalah A Guesmi MR Khaddar |
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| Institution: | 1. Laboratory of Coordination Chemistry, Department of Chemistry, Faculty of Sciences of Tunis, University of Tunis El Manar, 1060 Tunis, Tunisia;2. Unité de Recherche de Physico-chimie Moléculaire de l’IPEST, BP 51, 2070 la Marsa, Tunisia;3. Laboratoire de Matériaux et Cristallochimie, Département de Chimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 1060 Tunis, Tunisia |
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| Abstract: | The two octahedral complexes SnCl4 · 2(O)P(NR2)2OCH2CF3 (R = Me (1) or Et (2)) have been prepared from SnCl4 and the ligands (R2N)2P(O)OCH2CF3 in chloroform solution. Both adducts have been characterised by (31P and 119Sn) NMR, IR spectroscopy and elemental analysis. The NMR data show that the complexes exist as mixtures of cis and trans isomers in solution with the latter isomer being the predominant species. The structure of 1 has been determined by X-ray crystallography. Accordingly, the structure is centrosymmetric and the two ligands are bound trans to each other in the octahedral tin complex. DFT/B3LYP calculations show that trans configuration does indeed lead to the lowest energy species. Comparison of the structural, NMR and theoretical data of both complexes with those related to SnCl4 · 2L (L = (Me2N)3P(O) and (Me2N)2P(O)F) further supports the important effects of the nature of the substituents in the ligand on the stereochemistry of the complex formed. |
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| Keywords: | Fluoroalkyl phosphoramidate Tin(IV) chloride 119Sn NMR 31P NMR 2J(119Sn&ndash 31P) coupling constant DFT/B3LYP X-ray structure |
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