Crystal structure and spectral characterization of di-n-butyltin(IV) compound of vanillin

Abstract

Di-n-butyltin(IV) compound of vanillin was obtained by one pot reaction during the attempted synthesis of di-butyltin(IV) complex of 3-Hydroxy-2-(4-hydroxy-3-methoxybenzylideneamino)propionic acid. However, the expected compound could not be isolated, rather, the compound was crystallized as the dibutyltin(IV) complex of vanillin. The compound was characterized by elemental analysis, conductivity, fluorescence, UV, IR, ¹H-, ¹³C- and ¹¹⁹Sn-NMR spectroscopy. ¹¹⁹Sn-NMR spectroscopy study indicates the presence of exo and endo cyclic tin centers with five coordinate geometry in solution. The structure of the di-n-butyltin(IV) compound was determined by X-ray crystal structure analysis. The structure of the compound exhibits bis-tetraorganodistannoxane units involving hexa- and penta-coordinated environments around exo and endo cyclic tin atoms, respectively. The central endo-Sn ...  Sn contact is 3.361Å and the two independent exo-Sn ...  endo-Sn distances are 3.489(2) and 3.844(2) Å.