Tin(IV) and organotin(IV) complexes containing mono or bidentate N-donor ligands. V. Imidazole and imidazoline-2-thione derivatives: synthesis and spectroscopic charaeterization. Comparison with other imidazole tin(IV) complexes

The reactions of imidazole (L-1), benzimidazole (L-2), 2-phenylimidazole (L-3), 1-acetylimidazole (L-4), imidazoline-2(1,3H)-thione (L-5) and 1-methyl-imidazoline-2(3H)-thione (L-6) with RnSnCl4-n (R = Me-3 Bu-n or Ph; n =1, 2 or 3) were investigated. Twenty-seven navel adducts were obtained and characterized by analytical (elemental analysis conductivity and vaporimetric molecular weight measurements) and spectral (IR, far IR H-1 and Sn-119 NMR) data. The ligands L-1, L-2, L-3 and L-4 behave in the monodentate N-donor fashion, whereas L-5 and L-6 behave as monodentate S-donor molecules. Breaking of the N-CO bonds and protonation of imidazolate moiety occurred when the donor L-4 reacts with organotin accepters in not rigorously anhydrous conditions. The behavior of the adducts in acetone and chlorinated solvents is also discussed. Comparison was made with related organotin (IV) complexes of imidazoles.