On the Structural Property of Two Symmetrical N2O2-Coordination Schiff Base Compounds

Disulphide derivatives of imine compounds have the subject of intensive investigation over the past years, reflecting that they are excellent ligands for coordination to the metal ions. The disulphide group is well recognized as a potential binding site for metal ions in biological systems. In our present works we prepared two symmetrical Schiff base compounds N,N/-bis (2-hydroxy-3-methoxybenzylidene)-2,2/-(aminophenylthio) ethane [L₁] and N,N/-bis (2-hydroxybenzylidene)-2,2/-(aminophenylthio) ethane [L₂] by condensation of bis-(2-aminophenyl) disulphide with salen derivatives in absolute ethanol at room temperature. The structures of prepared compounds were checked by several spectroscopic methods. In the other part of this work the structure of these compounds have been optimized in gas phase and all quantum chemical parameters of the optimized L₁ and L₂ compounds have been discussed by some semi-empirical methods.