Synthesis, characterization and thermodynamic studies of complexes of dimethyl, diethyl, and diphenyltin(IV) dichlorides with (2H)-1,4-benzothiazine-2,3-(4H)-dione dioxime

Abstract

The diorganotin(IV) compounds, [Me₂SnCl₂(H₂L)], [Et₂SnCl₂(H₂L)] and [Ph₂SnCl₂(H₂L)] (H₂L = (2H)-1,4-benzothiazine-2,3-(4H)-dione dioxime), were synthesized by treating the appropriate diorganotin(IV) dichloride with H₂L in anhydrous ethanol. These complexes were characterized by IR, MS, UV-Vis, and ¹H NMR. Thermodynamic studies of the reported complexes have been carried out and their stability were found in the order: [Me₂SnCl₂(H₂L)] > [Et₂SnCl₂(H₂L)] > [Ph₂SnCl₂(H₂L)]. Theoretical calculations at the HF/3-21G* level showed that structures with alkyl groups at axial positions are more stable than their counterparts having alkyl groups at equatorial.

KEY WORDS: Diorganotin(IV) dichloride, vic-Dioxime, (2H)-1,4-Benzothiazine-2,3-(4H)-dionedioxime, Thermodynamic studies

Bull. Chem. Soc. Ethiop. 2012, 26(1), 85-94.

DOI: http://dx.doi.org/10.4314/bcse.v26i1.9