Tin(IV) and organotin(IV) complexes containing mono or bidentate N-donor ligands. V. Imidazole and imidazoline-2-thione derivatives: synthesis and spectroscopic characterization. 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 cha racterized 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. Break ing of the N-CO bonds and protonation of imidazolate moiety occurred when t he donor L-4 reacts with organotin accepters in not rigorously anhydrous co nditions. The behavior of the adducts in acetone and chlorinated solvents i s also discussed. Comparison was made with related organotin (IV) complexes of imidazoles. (C) 1998 Elsevier Science Ltd. All rights reserved.