Abstract
The reaction of tin tetrachloride with a series of variously substituted α-hydroxyphosphonates (L) in anhydrous dichloromethane produces new octahedral tin complexes of the type [SnCl4L2]. These adducts were characterized by multinuclear (1H, 13C, 31P and 119Sn) NMR, IR spectroscopy, and elemental analysis. The NMR data show that these complexes exist in solution as mixtures of cis and trans isomers. Moreover, the solution behavior of these complexes in the presence of excess ligand was investigated with variable temperature NMR using the coalescence temperature method. The resulting metal-ligand exchange activation energies were determined, showing values in the range 50–52 kJ/mol. The remote substituent effect on the metal-ligand interaction was also studied and compared with closely related phosphoryl-tin complexes.
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