Abstract
The synthesis of octahedral complexes [SnCl4L2] (L = R2NP(O)(OCH2CF3)(O-p-tolyl): R2N = Me2N (1), Et2N (2), CH2(CH2CH2)2N (3), and O(CH2CH2)2N (4), or L = R2NP(O)(OCH2CF3)(O-p-PhNO2): R2N = Me2N (5), Et2N (6), and O(CH2CH2)2N (7) is described. The new adducts have been characterized by multinuclear (31P, 19F, 119Sn) NMR, IR spectroscopy, and elemental analyses. The solution NMR data show the presence of a mixture of cis and trans isomers. The structure of the complexes in solution was further confirmed by 119Sn NMR spectra, which display a triplet for each isomer, indicating an octahedrally coordinated tin center. The effects of the nature of R and Ar substituents on the donor ability of the P=O group in the ligands R2NP(O)(OCH2CF3)(OAr) were investigated on the basis of 119Sn NMR chemical shifts and used to classify these ligands according to their Lewis basicity.
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