Tin(IV) Chloride Complexes of β-Chlorovinyl Aldehydes: A Multinuclear Nmr Characterization in Solution |
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| Authors: | Thouraya Barhoumi-Slimi M A K Sanhoury M T Ben Dhia M R Khaddar |
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| Institution: | Laboratory of Coordination Chemistry, Department of Chemistry, Faculty of Sciences of Tunis , University of Tunis El Manar , Tunis , Tunisia |
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| Abstract: | Abstract The reaction of SnCl4 with β-chlorovinyl aldehydes in anhydrous dichloromethane gave a series of octahedral complexes of the general formula SnCl4·2L (L = aldehyde). The adducts have been characterized in solution using multinuclear (1H, 13C, and 119Sn) NMR and IR spectroscopy. Solution NMR studies show that the complexes undergo rapid ligand dissociation at ambient temperature. Ligand exchange is slowed significantly at low temperature, such that, in most of the complexes, it is possible to identify both the cis and trans isomers with predominance of the cis form. The magnitude of the metal-ligand interaction was estimated on the basis of 119Sn NMR chemical shifts and used to classify the aldehydes studied according to their Lewis basicity. |
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| Keywords: | α β-unsaturated aldehydes tin(IV) chloride Lewis base 13C NMR 119Sn NMR |
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