Study of Stability and Calculate Thermodynamic Functions of a Number Complexes Derived from some Schiff Bases with Manganese Ion

Abstract

This study Includes the preparation of complexes metal by reacting the Schiff bases derived from some sulfa drugs with vanillin , para-dimethyl amino benzaladehyde and Ortho- hydroxyl benzaldehyde . The Schiff bases and complexes were identified by FT-IR, UV-Vis spectra melting points, molar conductance, and magnetic susceptibility. The data of spectroscopic studies of the complexes showed that the ratio of metal : ligand obtained were (1:2 ), also it showed the high Stability of the complexes and . Stability constant were decreased when the temperature increased , so this effected to thermodynamic functions. The data of molar conductance of the complexes showed that these complexes were non electrolyte , while has the complex (Mn-L7) except molar conductance by ratio (1:1) . The data of magnetic susceptibility of the complexes showed that the proposed geometry of the complexes was octahedral.